content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Approximation Solutions for Local Fractional Schrödinger Equation in the One-Dimensional Cantorian System
Advances in Mathematical Physics
Volume 2013 (2013), Article ID 291386, 5 pages
http://dx.doi.org/10.1155/2013/291386
Research Article
Approximation Solutions for Local Fractional Schrödinger Equation in the One-... | 5 | [
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Patent US5081613 - Method of identification of well damage and downhole irregularities
BACKGROUND OF THE INVENTION
This invention is in the field of petroleum and ground water engineering. More specifically, it is in the field of operation and maintenance of wells, including oil wells, gas wells and water wells
of all... | 4 | [
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please enter and help me>>>thanks
October 17th 2008, 09:07 AM
flower3
please enter and help me>>>thanks
find the limits by referring details when you solve them when (x,y)goes to (0,0) :
1_ lim (x^2 + y^2 ) sin ( 1\ (x ^2 + y^2))(i'm trying but i don't know )
2- lim e ^ -1 over (sqr root for x^2 + y^2)... | 5 | [
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Vectors Question
February 16th 2013, 12:32 PM #1
Vectors Question
Hi I'm stuck on the following questions:
a) Find an equation to describe the set of points equidistant from A(2, -1, 3) and B(1, 2, -3).
b) Find the coordinates of two points that are equidistant from A and B.
Please show the steps... | 4 | [
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Prove a tautology without truth tables.
[ negation p and (p or q)] implies q. I have no idea how to start.
"not p and p" is a contradiction. What does this tell you? Edit: Maybe it will make more intuitive sense if you put statements in. "It is true that I'm not happy and that: I'm happy or rich (or
both)." Do you see... | 5 | [
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help solve (i-j)^n=(iz-1)^n
July 29th 2009, 09:13 PM #1
Banned
Joined
Jul 2009
Posts
21
help solve (i-j)^n=(iz-1)^n
Hi,
I can't solve (i-j)^n=(iz-1)^n nor (z+i)^n + (z-i)^n =0.
I have tried dividing through and equating with the nth root but it hasn't gotten me anywhere?
Anoone know what t... | 5 | [
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Calculus - Fence over a wall.
November 18th 2009, 07:36 PM #1
Newbie
Joined
Nov 2009
Posts
2
Calculus - Fence over a wall.
A fence 5 feet tall runs parallel to a tall building at a distance of 4 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fen... | 4 | [
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Coursework regarding fraction differences (sequence with nth term- fractions)
December 12th 2007, 11:45 AM
math-
Coursework regarding fraction differences (sequence with nth term- fractions)
hi everyone!
ok, i have an investigation where i must consider some fraction sequences.
first row- 1/2, 2/3, 3/4... | 5 | [
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G
BASEBALL GEOMETRY
Grade: 6-8
Subject: Mathematics
Background:
Over the many years that baseball has been played, the ball itself has undergone many changes. Materials used inside and out have been tested, alternately resulting in advantages to pitchers and to
batters. This lesson will explore the specifications o... | 4 | [
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hydrostatic pressure
March 8th 2010, 07:38 PM
cdlegendary
hydrostatic pressure
Does anyone know how to setup the integral for the question below? I'm stumped (Headbang)
http://hw.math.ucsb.edu/webwork/math...-prob8_3_7.gif
A vertical plate is submerged in water and has the shape as seen in the picture.... | 5 | [
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Physics Forums - View Single Post - Sum of Identically Distributed Independent Random Variables
OK, let's see if we can find where my rusty calculus skills betrayed me.
(going to avoid using latex to put in the integral since it seems to come out weird when I preview it)
joint density = e^-x1e^-x2
we want: integral... | 5 | [
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Trig problem, ill paypal you 5 dollars if its right.
Need help, dont know how to solve, if you do, ill paypal you 5 dollars if its right.
cos x csc^2 x + 3 cos x = 7 cos x Thanks, Mike
cos x csc^2 x + 3 cos x = 7 cos x Rewriting that, cosXcsc^2(X) +3cosX = 7cosX cosXcsc^2(X) +3cosX -7cosX = 0 cosXcsc^2(X) -4cosX = 0 ... | 4 | [
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Series/logarithm questions
October 14th 2012, 07:18 PM #1
Newbie
Joined
Sep 2012
From
behind you
Posts
20
Series/logarithm questions
Hi, I was wondering how to solve these 2 questions:
c) use the proof from part a) and d) [e^x=>x+1 and (1+1)(1+1/2)...(1+1/n)=n+1] to prove that e^(1+1/2+1/3+...+1... | 5 | [
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Maple: ODE and PDE system coupled
P: 1
Hello,
This is my first post and hopefully my question has not been answered elsewhere already as I realize it is annoying to answer the same type of posts over and over again.
I am working on a system of PDEs with one ODE, coupled. It is an SEIR model with one extra class for ... | 4 | [
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Field Balancing of Magnetically Levitated Rotors without Trial Weights
Open Access This article is
• freely available
• re-usable
Article
Field Balancing of Magnetically Levitated Rotors without Trial Weights
^2
Science and Technology on Inertial Laboratory, Beihang University, Beijing 100191, China
^3
Schoo... | 4 | [
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Integration by Parts & Volumes of Revolution
June 7th 2009, 09:39 PM #1
Junior Member
Joined
Jan 2009
Posts
43
Integration by Parts & Volumes of Revolution
For the integration sign I'll use a capital s.
1) Find the volume of revolution when the area between y=(1/x), x=1, x=5, and y=0 is rotated abou... | 5 | [
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T-invariant subspace
October 25th 2010, 06:22 AM #1
Newbie
Joined
Oct 2010
Posts
12
T-invariant subspace
Let V be an n-dimensional vector space over F (can be taken equal to R or C). Let a be a non-zero scalar and let T be the operator defined on a basis v1,...,vn of V by
T(v1)=av1+v2, T(v2)=av2+v3,.... | 4 | [
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cyclic function proof..
Quote:
Question? Maybe I am misremembering but doesnt the period of $\sin(ax)+\sin(bx)$ have something to do with $\text{gcf}(a,b)$ or $\text{gcd}(a,b)$ or something? If so wouldn't that suffice to show
that because $a$ is irrational that this doesnt make sense?
you said that i... | 4 | [
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Angular deceleration of wheels.
February 14th 2011, 08:31 AM #1
Newbie
Joined
Feb 2011
Posts
11
Angular deceleration of wheels.
Right, so I have been stuck on this question for a while now but not sure where to start. I'm almost pulling my hair out, any guidance or pointers would be appreciated.
I n... | 4 | [
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search results
Expand all Collapse all Results 1 - 23 of 23
1. CJM 2010 (vol 62 pp. 737)
Approximation by Dilated Averages and K-Functionals
For a positive finite measure $d\mu(\mathbf{u})$ on $\mathbb{R}^d$ normalized to satisfy $\int_{\mathbb{R}^d}d\mu(\mathbf{u})=1$, the dilated average of $f( \mathbf{x})... | 4 | [
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lowest common denominator in fraction(help me with this problems)
1) $\frac{x}{x^2-5x+4} \ \ , \ \ \frac{x+1}{x^2-16}$ First, factor the denominators: $(x-1)(x-4) \ \ , \ \ (x-4)(x+4)$ The LCD is found by using all the different factors the most number of times
they appear in any one denominator. $LCD = (x-1)(x-4)(x+4)... | 4 | [
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Initial Value Problem
April 29th 2009, 09:32 PM
Krooger
Initial Value Problem
$dy/dt + 0.8ty = 2t$
$y(0) = 9$
This is what I have so far
$dy/dt = 2t - 0.8ty$
$dy/(2- 0.8y) = t dt$
$y/2 - 0.8ln|y| = (t^2)/2 + C$
Solve C:
$C = (9/2)-0.8ln|9|$
Now I'm having trouble isolating Y to g... | 5 | [
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Existence proofs
April 16th 2009, 01:21 PM
nikie1o2
Existence proofs
I need to show that there exists no non zero real numbers a,b such that the SqRt of a^2 plus b^2 is equal to the CubeRt of a^3 plus b^3... I have been pluggin in everything cant seem to find the
right combination !
April 16th 2009, 01:36 P... | 4 | [
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Equation
PART 3: Equations of Motion
The equations of motion constitute the core of the mathematical model of flight dynamics. These equations relate the forces acting on the aircraft to its position, velocity, acceleration and
orientation in space. Their derivation is more than an intellectual exercise. The correct ... | 4 | [
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Math Help
January 17th 2007, 04:51 PM #1
daniella
Guest
how do i use the "change of base" formula to solve
1 a) 3^2x=8
it is the exponent 2x
2 d) 5^x-2=150
it is to the exponent x-2
Thank You!
Hello, daniella!
You're expected to know that $b^x\:=\:a$ is equivalent to $x \:=\:\log_b... | 4 | [
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Double Inequalities
March 4th 2010, 11:46 PM
anonymous_maths
Double Inequalities
Need help to solve this:
0 < √1-x^2 < 1
answer is -1< x < 1
How does that work?
Thanks.
March 5th 2010, 12:27 AM
Prove It
Quote:
I take it that this is
$0 \leq \sqrt{1 - x^2} \leq 1$.
Squ... | 4 | [
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Limiting distribution involving chi square distribution
October 20th 2009, 03:58 PM
statmajor
Limiting distribution involving chi square distribution
Let Zn be a chi square distribution with n degrees of freedom. Let Wn = Zn/n^2. Find the limiting distribution of Wn.
I know the MGF of a chi square distribut... | 5 | [
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Math Help
Determine which of the following functions $f_i: \mathbb{R} \to \mathbb{R}$ are injective, surjective, and bijective. If they are bijections write down their inverses.
(i) $f_{1}(x) = x-1$ is a bijection (inverse function is $y = x+1$)
(ii) $f_{2}(x) = x^3$ is a bijection (inverse is $y = \sqrt... | 5 | [
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tangent lines in curves
October 10th 2008, 07:21 PM #1
Newbie
Joined
Sep 2008
Posts
21
tangent lines in curves
1) If
Use this to find the equation of the tangent line to the parabola
and where
but i think b = 27 but apparently its not.
2)For what values of x does the graph of
I do... | 5 | [
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-0.063476562... | 22,928 | 22928 | |
differentiation question
February 22nd 2011, 11:05 PM #1
Member
Joined
Nov 2010
Posts
93
differentiation question
Hello, I am having trouble understanding how to differentiate this polynominal.
Can someone please outline the steps. I want to use the Newton and Leibniz method rather than the first pri... | 4 | [
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help with this trig identity problem
November 9th 2012, 02:54 PM #1
Junior Member
Joined
Jun 2012
From
Australia
Posts
36
help with this trig identity problem
Hi all again!
Hoping you can help me with this one as I dont really have a clue how to go about it properly:
$2sin^2 x + 3cos x-3=0$... | 4 | [
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Scott Pilgrim Vs. Gravity
More than three weeks after its opening, Scott Pilgrim Vs. The World appears to be limping towards the end of its theatrical run. For whatever reason (some blame marketing, others blame Michael Cera
exhaustion, for others the fault lies with a crowded weekend of opening releases) this action... | 5 | [
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Opinion about y =f(y)
Yeh! (why didn't I thought about that before!, thanks)For example we know that the solution of ODE
[tex]\frac{d^2y}{dx^2}=y , y(0)=1 , \frac{dy}{dx}(0)=0[/tex]
is y=coshx (integrating it with the usual method for linear-2nd-oreder-homogeneus ODE).
The method I exposed will give the solution by ... | 5 | [
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... | 22,932 | 22932 | |
integral that converges……..
Question#01:- (a) Evaluate the integral that converges $\int_0^{\pi/2}\tan(x) dx$. I don't understand the question, this integral diverges does it not? RonL
Question#01:- (b) Find the value of "a", If $\int_0^{+\infty}\frac{1}{x^2+a^2} dx=1$. Well this is a standard integral, and: $\int_0^{... | 5 | [
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Is this vector calculus problem correct?
November 14th 2013, 11:18 AM #1
Junior Member
Joined
Mar 2009
Posts
62
Is this vector calculus problem correct?
A scalar field $\phi$ is a function of x,z and t only. Vectors ${\bf{E}}$ and ${\bf{H}}$are defined by:
${\bf{E}} = \frac{1}{\varepsilon }... | 4 | [
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Derivative Notation Issue
December 28th 2010, 08:26 PM #1
Newbie
Joined
Oct 2010
Posts
18
Derivative Notation Issue
Guys I am sorry if this question has been asked before, but it has been pestering me for long time. It is about the notation of derivatives using 'prime'.
If f(x) is a function of x, t... | 4 | [
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Finite Element Approximation of Maxwell's Equations with Debye Memory
Advances in Numerical Analysis
Volume 2010 (2010), Article ID 923832, 28 pages
http://dx.doi.org/10.1155/2010/923832
Research Article
Finite Element Approximation of Maxwell's Equations with Debye Memory
BICOM, Institute of Computational Mathemati... | 4 | [
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... | 22,936 | 22936 | |
Milestones in the Development of Iterative Solution Methods
Journal of Electrical and Computer Engineering
Volume 2010 (2010), Article ID 972794, 33 pages
http://dx.doi.org/10.1155/2010/972794
Review Article
Milestones in the Development of Iterative Solution Methods
Institute of Geonics AS CR, 70800 Ostrava, Czech ... | 4 | [
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What is the Franck-Condon principle?
From the BO approximation, we have the product of the electronic [itex]\varphi_i(r,R)[/itex] and the nuclear [itex]\eta_i(R)[/itex] wavefunction. For the transition, we use Fermi's Golden rule, where
the Dipole-Operator [itex]\mu[/itex] "initiates" the transition. So we end up in
[... | 4 | [
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0.01916... | 22,938 | 22938 | |
polinomial solution question..
March 3rd 2009, 09:51 AM #1
MHF Contributor
Joined
Nov 2008
Posts
1,401
polinomial solution question..
$<br /> x^{13}+x^7-x-2006=0\\<br />$
prove that there is a solution on this interval
$<br /> \left ( \sqrt[6]{\frac{\sqrt{101}-7}{26}},0\right )<br />$
i trie... | 5 | [
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Conditional probability
May 1st 2010, 06:02 AM #1
Senior Member
Joined
Jul 2006
Posts
364
Conditional probability
Suppose we have 2 events: $s, e$.
We know:
$P(e)=.7$
$P(e|eg s)=.15$
$P(e|s)=1$
What is $P(s)$?
----------
I know that $P(s) = 1 - P(eg s) \Rightarrow P(eg s)... | 5 | [
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prove (log a b^2).(log b a^3) = 6
Before I start I would like to suggest that you repeat the problem statement in the written portion of your post. It would be easier for us to see what you are trying to write, particularly when we
get LaTeX back. I presume that "log a b^2" is "log to the base a of b^2? Let me rewrite ... | 4 | [
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Trig Application
June 17th 2009, 12:24 AM #1
Junior Member
Joined
May 2009
Posts
29
Trig Application
Just an exercise I came across in my revision in which I have no idea how to do
The variation in blood pressure for a typical person can be approximately modelled by the funtion:
$P(t) = 20sin\B... | 4 | [
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... | 22,942 | 22942 | |
trigonometric integral
hello Anyone know how to solve this ?? $\int \dfrac{ sin\theta - cos\theta }{ \sqrt{sin 2\theta} } d\theta$
$sin(2\theta)=1+sin(2\theta)-1=sin^2(\theta)+cos^2(\theta)+sin(2\theta)-1=(sin(\theta)+cos(\theta))^2-1$ so your integral = $\displaystyle \int \dfrac{ sin(\theta) - cos(\theta) } { \sqrt{... | 4 | [
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Math Help
April 17th 2008, 08:35 AM #1
Newbie
Joined
Mar 2008
Posts
21
Hi guys,
I've got this exercise where i've gotten stuck on. Differentiate $ln(cos(1/x ))$ on its domain of definedness. I'm hoping I can get some guidance/help if i've gone wrong in what i've already done
and in completing it.
... | 4 | [
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Multiplicative Inverse
May 11th 2012, 09:34 AM #1
Member
Joined
May 2009
Posts
109
Multiplicative Inverse
This is in regard to proving that the statements (a) $a$ and $n$ are coprime and (c) row $a$ of the multiplication table for $Z_{n}$ includes all of $Z_{n}$
$ab = kn + 1$
"this equation imp... | 4 | [
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0.0... | 22,945 | 22945 | |
Patent US5151953 - Single chip 2-D convolver
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates generally to matrix processors and more specifically to matrix processors of images.
Modern image processing frequently requires that a massive number of repetitive computations be performed on a single ... | 4 | [
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0... | 22,946 | 22946 | |
Help with Trig problem
Try using this ratio, $\displaystyle \frac{2}{\sqrt{3}} = \frac{y^2+1}{2y}$ You now have one equation with one variable.
yea but then i get stuck @ 4y=root3 (y^2+1) and don't know how to solve from there.
Expand the RHS, then group all terms onto the one side. After this apply the quadratic for... | 4 | [
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... | 22,947 | 22947 | |
Complex line integral
April 11th 2012, 01:24 AM
monster
Complex line integral
I'm doing a question where i have to calculate a the line integral; ∮z .dz over a simple closed contour, which as expected ( By Cauchy) came out as 0.
It's the supplementary questions that are confusing, i'm asked to calculate the ... | 4 | [
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determine the current flowing thru an element
determine the current flowing thru an element is the charge flow is given by:
(a) $q(t) = (3t+8) mC$
assume the way to do this is just
$<br /> i= \frac{dq}{qt}=\frac{d}{dt} (3t+8)mC= \boxed{3mC}<br />$
assume we keep the same units for answer.
th... | 5 | [
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0.08886718... | 22,949 | 22949 | |
Math Help
December 1st 2009, 08:02 AM #1
Junior Member
Joined
Jul 2009
Posts
25
Modular
I have two questions involving mod m that I am struggling with and I was hoping someone could give me some tips on how to start and or complete them
1. if a = b(mod m) and a = b(mod n), prove a = b(mod mn), I kn... | 4 | [
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... | 22,950 | 22950 | |
Biological interpretation
4.6. Biological interpretation of Stochastic Models. Response surfaces.
The major advantage of stochastic models is that they can be built automatically from a given data set using existing statistical software. No programming and no high mathematics is needed. However,
the cost of this simpl... | 4 | [
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Carpentry problem
August 14th 2011, 07:25 AM
explodingtoenails
Carpentry problem
Two carpenters are trying to carry a board down a corridor and around a corner in a building. The corner is at a 90degree angle and the corridor is 9 feet wide. What is the length of the longest
board that can be carried paralle... | 5 | [
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partial fractions (quardratic factor in denominator)
September 13th 2009, 05:10 AM #1
hi am having difficulty figuring this one out can u help?
6/(x+1)(x-1)(x-4)^2
so far this is what i got but i'm not sure its correct....
A/(x+1) + B/(x-1) + (Cx+D)/(x-4)^2
considering just the frc (Cx+D)/(x-4)^... | 5 | [
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0.0441894531... | 22,953 | 22953 | |
One interval where the graphs concave upwards, and one where it is concave downwards
March 26th 2013, 05:41 AM #1
Junior Member
Joined
Oct 2010
Posts
63
One interval where the graphs concave upwards, and one where it is concave downwards
Where is the function Concave Up and Down?
Hi im trying to fin... | 5 | [
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-0.056640625,
0.09619140625,
-0.0020599365234375,
-0.01611328125,
0.08642578125,
-0.04296875,
0.1171875,
0.07275390625,
0.0167236328125,
0.0986328125,
0.07470703125,
-0.09423828125... | 22,954 | 22954 | |
present value
September 27th 2008, 05:25 PM #1
present value
1. Calculate the present value for each section using compound interest. A) You need $1,000 in 8 years. You can invest your money at 3%/a compounded semiannually.
B) You need $200 in 30 months. You can invest your money at 6%/a compounded month... | 4 | [
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0.0498046875,
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0.01409912109375,
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0.015625,
-0.07275390625,
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Patent US5067101 - Topography simulation method
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a topography simulation method. More particularly, the present invention concerns a simulation method which enables estimation of the three-dimensional shape of a
region of a workpiec... | 4 | [
-0.06982421875,
0.0869140625,
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-0... | 22,956 | 22956 | |
Areas under and between polar curves
April 25th 2008, 12:46 PM #1
Member
Joined
Aug 2007
Posts
96
Areas under and between polar curves
Find the area of the region outside r=9+9sin(theta), but inside r=27sin(theta)
I did the integral of .5((27sin(theta))^2-(9+9sin(theta))^2), from pi/6 to 5pi/6, but g... | 4 | [
0.039794921875,
-0.046875,
-0.052978515625,
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0.1435546875,
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0.08251953125,
0.048828125,
-0.0130615234375,
-0.08837890625,
-0.01... | 22,957 | 22957 | |
Dimmensional Analysis Of Drag On A Sphere Equation Problem
October 18th 2012, 06:51 AM #1
Newbie
Joined
Oct 2012
From
Indiana
Posts
11
Dimmensional Analysis Of Drag On A Sphere Equation Problem
Making Assumptions:
$D_{F} = f(R,v,\rho ,\mu )$
Drag force is equal to a function of radius, velo... | 4 | [
-0.03759765625,
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0.0849609375,
-0.02001953125,
-0.01336... | 22,958 | 22958 | |
Primitive Zero-Symmetric Sign Pattern Matrices with Zero Diagonal Attaining the Maximum Base
Journal of Applied Mathematics
Volume 2012 (2012), Article ID 276386, 28 pages
http://dx.doi.org/10.1155/2012/276386
Research Article
Primitive Zero-Symmetric Sign Pattern Matrices with Zero Diagonal Attaining the Maximum Bas... | 5 | [
-0.03173828125,
0.037353515625,
-0.004425048828125,
-0.055419921875,
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-0.040771484375,
-0.008544921875,
0.00004363059997558594,
0.001953125,
0.0927734375,
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0.0380859375,
0.005157470703125,
0.000457763671875,
0.01092529296875,
-0.0137939453... | 22,959 | 22959 | |
-Self-Adjoint Extensions for a Class of Discrete Linear Hamiltonian Systems
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 904976, 19 pages
http://dx.doi.org/10.1155/2013/904976
Research Article
-Self-Adjoint Extensions for a Class of Discrete Linear Hamiltonian Systems
^1School of Mathematics and Qua... | 4 | [
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... | 22,960 | 22960 | |
Calculus: Integration by Substitution Videos | MindBites
Series: Calculus: Integration by Substitution
Included: (Click to preview)
About this Series
• Lessons: 2
• Total Time: 0h 23m
• Use: Watch Online & Download
• Access Period: Unlimited
• Created At: 06/23/2009
• Last Updated At: 07/20/2010
In this... | 4 | [
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area of face = square of ht; show ratio is golden mean
The area of a triangular face of a square-based pyramid is equal to the square of the vertical height of a pyramid. Show how the ratio of the height of each of the faces to one half of the length of
the base of the face is the Golden Mean.
ive looked up the golden... | 4 | [
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... | 22,962 | 22962 | |
Fun Integrals!
February 22nd 2013, 01:07 AM
sbhatnagar
Fun Integrals!
These are some of my favorites.
1. $\int_0^1 \frac{1}{1+ _2F_1 \left( \frac{1}{n},x;\frac{1}{n};\frac{1}{n}}\right)}dx$ where $_2F_1 (a,b;c;z)$ is the Gaussian Hypergeometric Function.
2. $\int_{-\infty}^{\infty}\frac{\cos(s\arctan (... | 5 | [
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0.0322265625,
-0.037353515625,
0.047607421875,
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0.042236328125,
-0.0223388671875,
-0.0089111328125,
-0.0181884765625,
-0.0306396484375,
0.028076171... | 22,963 | 22963 | |
I need help with a homework question - Statistical Significance
July 15th 2010, 11:14 AM #1
Newbie
Joined
Jul 2010
Posts
1
The manufacturer of a daily dietary supplement claims that its product will help people lose weight. The company obtains a random sample of 950 adult males aged 20 to 74 who take the ... | 5 | [
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0.01385498046875,
-0... | 22,964 | 22964 | |
gamma function question for x < 0
October 17th 2008, 02:56 PM #1
Junior Member
Joined
Sep 2008
Posts
55
gamma function question for x < 0
so I know the gamma function defined:
T(x) = [integral from 0 to infinity] t^(x-1)e^(-t)dt
converges for x > 0
I also know that T(x+1) = xT(x)
does ... | 4 | [
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0.05029296875,
-0... | 22,965 | 22965 | |
Need sum and difference on trigonomtery
September 27th 2006, 03:26 PM #1
Newbie
Joined
Sep 2006
From
MI
Posts
23
Need sum and difference on trigonomtery
Hi,
I'm getting close to the right answer, but one little thing is off. I think I'm missing a negative somewhere...
"Find the exact value... | 4 | [
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How do you isolate for y when 0 = 2y + e^y
MathewsMD
How do you isolate for y when you have the equation 0 = 2y + e^y - 4x + 3?
Any tips, useful links or solutions and an explanation would be greatly appreciated!
Thanks!
Well, when we have these mixed exponential equations, we try to put it in Lambert-W form. Tha... | 5 | [
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0.056640625,
0.017578125,
-0.12255859375,... | 22,967 | 22967 | |
Growth - please help check my answers
January 24th 2009, 01:31 AM #1
Newbie
Joined
Jan 2009
Posts
8
Growth - please help check my answers
A property developer is planning to build houses on 4 acres of land. She estimates that if she builds 16 houses, the profit per house will be $400,000, and that each a... | 4 | [
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0.0201416015625,
0.07080078125,
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-0.01220703125,
-0.0... | 22,968 | 22968 | |
Combinations
3. How many ways can you distribute 12 apple pies amoung 6 food banks?
One thing I hate about these problems is that it is unclear what they want. Are the pies interchangeable? So if you only deliver 1 pie to the first location, does it matter which pie? If the answer
is yes, different pies would be count... | 4 | [
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0.07666015625,
-... | 22,969 | 22969 | |
Estimates of Henstock-Kurzweil Poisson Integrals
http://dx.doi.org/10.4153/CMB-2005-012-8
Canad. Math. Bull. 48(2005), 133-146
Published:2005-03-01
Printed: Mar 2005
• Erik Talvila
If $f$ is a real-valued function on $[-\pi,\pi]$ that is Henstock-Kurzweil integrable, let $u_r(\theta)$ be its Poisson integral. It i... | 4 | [
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... | 22,970 | 22970 | |
Nati's Influence
Nati’s Influence
When do we say that one event causes another? Causality is a topic of great interest in statistics, physics, philosophy, law, economics, and many other places. Now, if causality is not complicated
enough, we can ask what is the influence one event has on another one. Michael Ben-Or a... | 4 | [
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... | 22,971 | 22971 | |
finding expression and combining like terms
February 21st 2007, 03:00 PM #1
finding expression and combining like terms
1. A triangle has sides 3x + 7, 4x , and 5x + 6. Find the expression
that represents its perimeter.
Combining like terms
2. 7(4w-3)-25w
1. To find the perimeter of a tr... | 4 | [
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0... | 22,972 | 22972 | |
Triangle vertex
July 10th 2008, 09:29 PM #1
Triangle vertex
The points A(5,1) and B(-3,6) represent one of the equal sides of an isosceles triangle. Determine one of the possible points that would represent the third vertex of the triangle. Provide
calculations to support your answer.
Thanks
The thi... | 4 | [
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-0.043701171875,
-... | 22,973 | 22973 | |
[SOLVED] I Have a Circle inside a Square, and I am asked to find a length
February 8th 2009, 08:58 AM #1
Newbie
Joined
Jan 2009
Posts
3
[SOLVED] I Have a Circle inside a Square, and I am asked to find a length
I have a square ABCD, with lengths 8cm
I have a circle inside the square, as big as it can ... | 4 | [
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0.034912109375,
0.0341796875,
0.... | 22,974 | 22974 | |
Patent US5608737 - Maximum likelihood decoder and decoding method
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a maximum likelihood decoder and a maximum likelihood decoding method, and more particularly, to a device for and a method of maximum-likelihood-decoding a... | 4 | [
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-0.0625,
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0.0106201171875,
0.0737... | 22,975 | 22975 | |
What Iterative Method is This?
I haven’t really done much related to systems of linear equations for a couple years, so my memory is a bit faded. But, I was wondering if anyone could tell me what iterative method this is. I made
it up a while ago to see if it would work, and have recently been coding it to see that it ... | 4 | [
-0.06884765625,
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0.0615234375,
0.00125885009765625,
0.103515625,
0.07177734375,
-0.01519775390625,
-0.040283203125,
0.1142578125,
-0.0458984375,
0.015869140625,... | 22,976 | 22976 | |
An Effective Method for Borehole Imaging of Buried Tunnels
International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 246472, 9 pages
http://dx.doi.org/10.1155/2012/246472
Research Article
An Effective Method for Borehole Imaging of Buried Tunnels
^1Department of Informatics, Mathematics, Elect... | 4 | [
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0.0319... | 22,977 | 22977 | |
second order linear nonhomogenous
April 7th 2007, 10:49 AM #1
Junior Member
Joined
Mar 2007
Posts
63
second order linear nonhomogenous
3>Find the general solution for y” + y’=e^ x –sin(x)
5.Given that y=e ^(–x) is a solution for the differential equation xy” +(x-1) y’ – y=0,
find its general sol... | 5 | [
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0.06396484375,
0.001983642578125,
-0.0140380859375,
0.011535644... | 22,978 | 22978 | |
derangement question
December 7th 2009, 07:57 PM #1
Junior Member
Joined
Nov 2009
Posts
37
A brand new standard deck of 52 playing cards comes with the cards arranged in a particular order. Before using them, the cards are shuffled. What is the probability that exactly 10 of the cards
will remain in t... | 5 | [
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-0.028564453125,
-0.0006904... | 22,979 | 22979 | |
solving triangles
October 10th 2009, 02:25 PM #1
Junior Member
Joined
Sep 2009
Posts
66
solving triangles
The hypotenuse of a right triangle is 8 more than the shorter leg. The longer leg is 4 more than the shorter leg. Find the length of the shorter leg.
i know your supposed to set up the equation... | 4 | [
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0.0703125,
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-0.0296630859375,
-0.0037... | 22,980 | 22980 | |
Dot product and cross product
August 30th 2010, 06:55 PM
Pinkk
Dot product and cross product
Given vectors $a,b\in \mathbb{R}^{3}$ and that $a\cdot c = b\cdot c$ and $a \times c = b\times c$ for some nonzero vector $c$, prove that $a=b$.
So I showed that if $a = 0$ then $b=0$, so now I assume $a,b$ are nonz... | 4 | [
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0.06396484375,
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0.0942... | 22,981 | 22981 | |
Primitive Roots - Show that k is odd?
October 30th 2012, 04:26 PM
ncshields
Primitive Roots - Show that k is odd?
If g and h are primitive roots of an odd prime p, then g is congruent to h^k (mod p) for some integer k. Show that k is odd.
Suppose g and h are primitive roots of an odd prime p. This means tha... | 4 | [
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... | 22,982 | 22982 | |
Help with daughter's homework
February 5th 2008, 07:52 PM #1
Newbie
Joined
Feb 2008
Posts
2
Help with daughter's homework
I was trying to help my daughter solve a problem from her algebra homework. The answer I found through trial and error as well as from another site (c = 40.5511), but the steps to get... | 4 | [
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Find sin (x + y)
May 6th 2009, 05:42 AM #1
MHF Contributor
Joined
Jul 2008
From
NYC
Posts
1,489
Find sin (x + y)
Angle x is acute, angle y is obtuse, cos x = 15/17
and sin y = 3/5. Find sin (x + y).
After doing the math, I found sin (x + y) to be 77/85.
The textbook tells me that the an... | 4 | [
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Inequalities between Arithmetic-Geometric, Gini, and Toader Means
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 830585, 11 pages
http://dx.doi.org/10.1155/2012/830585
Research Article
Inequalities between Arithmetic-Geometric, Gini, and Toader Means
Department of Mathematics, Huzhou Teachers College, ... | 5 | [
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Difference Equations
June 9th 2009, 05:43 PM #1
Member
Joined
Apr 2008
Posts
191
Difference Equations
Here's my question:
The answer to this probelm is:
$<br /> S_{n} = 0.076 S_{n-1}<br />$
I don't see how to get this answer, here's my attempt:
Equation has to be of the form $S_{n} ... | 4 | [
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Sum of series
May 21st 2008, 08:36 AM #1
Member
Joined
Sep 2007
Posts
222
What is the sum of the following series:
SUMMATION(n=1 to infiniti) -1/(n^2 + 9n + 20)
I tried using the forumula:
sum = a/(1-r)
But i cant get an exact value for r so i am not sure
Thanks
$\frac{a}{1-r}... | 5 | [
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Physics Forums - View Single Post - Integrating factor
Or can approach it this way:
[tex](2x^2+y)dx+(x^2y-x)dy=0[/tex]
So, after a quick check for homogeneous, exact, and explicit calc. of an integrating factor via partials, we expand the differentials and attempt to group them together to form exact differentials:
... | 4 | [
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Math Help
Must the center of a group be made up of congugacy classes?
Last edited by alexandrabel90; May 13th 2011 at 01:20 PM.
What does this mean? Is it true that the center of a group is a union of conjugacy classes? The answer is yes for two reasons. The first reason is the fact that $\mathcal{Z}(G)\unlhd G$ for... | 5 | [
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Least Squares Solution for a Parabola
May 26th 2009, 10:23 AM #1
Newbie
Joined
May 2009
Posts
5
Least Squares Solution for a Parabola
Hi there,
I have a set of data points
{(X1,Y1), (X2,Y2),........(Xn,Yn)}
I would like to approximate the relation between X and Y as a parabola. Assuming th... | 4 | [
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Factoring Polynomials
January 28th 2009, 12:31 PM
4lgebra
Factoring Polynomials
Hello, Im new to factoring polynomials:
6st + 15t -10s -25
(6st + 15t) + (-10s -25) <-- Grouped polynomials
Common factors of both groups:
(6st + 15t) --> 3t
(-10s -25) --> -5
Now factor out the common fac... | 4 | [
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Solve for X values
So, first would probably be grouping. You would take the x^3 and group it with the 3x^2. Factor that into x^2 (x-3) + 3 Then it would just be (x^2+3) (x-3)
so factor for this eqn will be x= 3, and 2 imaginary fators will be there with "i"(iota)
you have 3 real roots, see the graph. By Descartes law... | 5 | [
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Patent US4499598 - Edge and line detection in multidimensional noisey, imagery data
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to digital pattern recognition systems and, more particularly, but not by way of limitation, it relates to an improved form of pattern detection dev... | 4 | [
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Patent US7136489 - Method and system for enhancing network security using a multilateral authorization mechanism
CROSS-REFERENCE
This application is related to U.S. patent application Ser. No. 10/082,854, filed on Feb. 25, 2002.
BACKGROUND
This disclosure relates generally to techniques for enhancing security in a c... | 4 | [
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Proof by contradiction
February 3rd 2010, 01:10 PM
nikie1o2
Proof by contradiction
If u and v have different parities( one is even and one is odd), then ( a,b,c) is primitive.
Fact: If (a, b, c) is not primitive, then there exists a prime number p and natural numbers a`, b`, c` , such that a=pa`, b=pb` , c=... | 4 | [
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approximate with Taylor remainder
May 17th 2008, 06:27 AM
karma
approximate with Taylor remainder
Hello everyone! (Wink) I am trying to prove that the following inequality is right for all n equal to or larger than 9. I tried using the triangle inequality and then mathematical induction but
none of it seems ... | 5 | [
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Calculus assignment
April 20th 2008, 04:37 PM
CenturionMonkey
Calculus assignment
I'm doing an assignment on trig derivatives, limits, and graphing. I have no clue how to do this question though...
the limit as x approaches 0 of:
(tanx - sinx)/( $x^2$tanx)
ps. sorry if you don't understand my ques... | 5 | [
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Shortest distance Point - surface
June 25th 2010, 04:08 AM
Klo
Shortest distance Point - surface
Im supposed to find the point B(x,y,z) which is a point on the surface z = x^2 + y^2 and is closest to the point A(3,0,0,)?
HOW? (Thinking)
I was said to differentiate the distance D between B and A, ( $D^2... | 5 | [
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PCs in a Linear Network with Homogeneous Spatial Autocorrelation
As I observed a couple of posts ago, the Stahle SWM network can be arranged so that its correlation matrix is closely approximated by a Toeplitz matrix i.e. there is a “natural” linear order. I also
noted that results from matrix algebra proving that, und... | 4 | [
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0... | 22,999 | 22999 |