content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Patent US20020198896 - Method of building multidimensional workload-aware histograms
TECHNICAL FIELD
[0001] The present invention relates generally to the field of database systems. More particularly, the present invention relates to the field of histogram construction for database systems.
BACKGROUND OF THE INVENTIO... | 4 | [
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Calculus Implicit Differentiation
Use implicit differentiation to find dy/dx if cos xy = 2x^2-3y Thanks!
Hello, SoYah! Quote: Use implicit differentiation to find $\tfrac{dy}{dx}$ if $\cos(xy) \:= \:2x^2-3y$ We have: . $-\sin(xy)\left(x\frac{dy}{dx} + y\right) \:=\:4x - 3\frac{dy}{dx}$ . . . . . . $-x\
sin(xy)\frac{dy... | 5 | [
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Block matrices and determinant.
January 20th 2010, 10:36 AM #1
Block matrices and determinant.
Let A, B, C, D be matrices of order 2 with elements over field F.
Suppose M is block-matrix that in her first row are A and B and in second row C and D.
M is matrix of order 4.
Is det(M) = det(A)*det(D) -... | 5 | [
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integration problems
March 17th 2009, 07:18 AM #1
integration problems
i'm having trouble (as always), starting these problems. hints on how to start would be nice.
evaluate the integrals
a). $\int sin\sqrt(at)dt$
i think i have to do this by integration by parts, so i have:
$f(x) = sin \sqrt(... | 5 | [
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Parallelogram proof lenth of diagonal and angle. urgent help needed
December 8th 2009, 09:26 PM
thcbender
Parallelogram proof lenth of diagonal and angle. urgent help needed
Hi new here.
ABCD is a paralleologram in which the lengths of AB and AD are 5 cm and 12 cm respectively and angle ABC is 50 degrees.
... | 4 | [
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Lower limit to the diameter
mfb
I don't know where your formula comes from
I did:
[itex]\frac{dP}{dr}[/itex]=[itex]ρg[/itex]
and [itex]g[/itex]=[itex]\frac{GM}{r^2}[/itex]
so [itex]\frac{dP}{dr}=\frac{-GMρ}{r^2}[/itex] (Hydrostatic equilibrium equation)
and [itex]\frac{dM}{dr}[/itex]=[itex]4πr^{2}ρ[/itex] (equa... | 5 | [
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More expected value
November 18th 2009, 02:27 PM
Twig
More expected value
Hi!
A family has children until it has a boy or until it has three children, whichever comes first. Assume the child is a boy with probability $\frac{1}{2}$. Find the expected number of boys in this
family, and the expected number... | 5 | [
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Physics Forums - View Single Post - Deriving the critical radius of Uranium using diffusion equation
1. The problem statement, all variables and given/known data
I have solved the equation for the neutron density as a function of position and time. I need the boundary conditions to change my infinite number of soluti... | 4 | [
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Calculus - behaviour of functions - first derivative and the likes
1. The problem statement, all variables and given/known data
Given P(x) = x4 + ax3 + bx2 + cx + d such that x = 0 is the only real root of P'(x) = 0. If P(–1) < P(1), then in the interval [–1, 1]
(1) P(–1) is not minimum but P(1) is the maximum of P
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integrals differening by konstant
November 2nd 2006, 08:01 AM #1
Junior Member
Joined
Oct 2006
Posts
33
integrals differening by konstant
i think thsi is easy but cant think of the answer can some1 help me out
thanx
edgar
Suppose f is continuous on a domain D. Prove that any two primitives
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Transformation
June 18th 2008, 10:01 AM #1
Transformation
If $T: \begin{pmatrix} x \\y \\z \end{pmatrix} ->\begin{pmatrix} x \\x+y \\x+z \end{pmatrix}$ then what does $T \begin{pmatrix} x+y \\y \\y+z \end{pmatrix}$ equal?
Can you show in steps as I find this topic confusing. Thanks in advance.
Still bre... | 5 | [
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Sage: 3D Data Plotting
Exclusive offer: get 50% off this eBook here
Sage Beginner's Guide — Save 50%
Unlock the full potential of Sage for simplifying and automating mathematical computing with this book and eBook
$29.99 $15.00
by Craig Finch | May 2011 | Open Source
Sage can make 3D plots for visualizing function... | 4 | [
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Definite Integration
January 24th 2010, 05:10 AM
driver327
Definite Integration
find the total area between the region and the the x-axis.
y = -x^2 - 2x when -3 <= x <= 2 (which i took it as [-3,2])
This was my work:
I integrated the equation:
-(1/3)x^3 - x^2 [-3,2]
I plugged in the numbe... | 4 | [
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Newtons Method
October 27th 2007, 09:41 PM #1
Newtons Method
Use Newtons method to find the two solutions of e^x=5*x to three decimal places.
Newtons Method: X(n+1) = Xn - f(Xn)/f'(Xn)
I just dont understand how you would set this up. Do you set both the approximations equal to each other to solve or do ... | 5 | [
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Lunardi: On the Ornstein-Uhlenbeck operator in spaces of continuous functions
"... Abstract. We consider a second-order parabolic equation in R d+1 with possibly unbounded lower order coefficients. All coefficients are assumed to be only measurable in the time variable and
locally Hölder continuous in the space variab... | 4 | [
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Finite sum question
March 26th 2011, 02:27 AM #1
Finite sum question
Hi. I need help in the following problem please.
If $(1+z)^n=a_0 + \sum{a_k z^k}$, where $n$ is a positive integer, prove that:
$a_0+a_4+a_8+...=2^{n-2} + 2^{\frac{1}{2}n-1}cos\frac{n\pi}{4}$
Thank you
I haven't worked out the ... | 4 | [
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Arc Length and Curvature (3D vectors)
February 19th 2009, 02:36 PM
acg716
Arc Length and Curvature (3D vectors)
Let C be the curve of intersection of the parabolic cylinder x2 = 2y, and the surface 3z = xy. Find the exact length of C from the origin to the point (5, 25/2, 125/6).
My instructor told us to pu... | 4 | [
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Motion in 2D
mugzieee
A ball is thrown toward a cliff of height h with a speed of 30 m/s and an angle of 60degrees above horizontal. It lands on the edge of the cliff 4.0 s later.What was the maximum height of the ball?
I try using this equation:
y_f=y_i+v_iy(deltaT)+.5a_y(deltaT)^2
for y_i, i have 0
for v_iy i have 2... | 4 | [
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Another Application Problem
September 12th 2010, 05:20 AM #1
Super Member
Joined
Dec 2008
Posts
509
Another Application Problem
Hi
The following question i am having trouble completing
The equation of motion of a mass on the end of a vertical spring is
$\frac{d^2y}{dt^2} +4y = 0$
(where... | 4 | [
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proof involving limits
July 26th 2009, 09:48 PM #1
Junior Member
Joined
Nov 2006
Posts
41
proof involving limits
Need help with the following proof:
prove that if lim x->c 1/f(x)= 0 then
lim x->c f(x) does not exist.I think i need to use the delta epsilon definition i am not sure how to set it up... | 4 | [
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Principles of Finance/Section 1/Chapter 7/Port/Correlation
A Wikibookian has nominated this page for cleanup because:
This needs text to explain the equations
You can help make it better. Please review any relevant discussion.
A two security portfolioEdit
When building a portfolio, it is important not only to c... | 5 | [
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Probability question
March 27th 2008, 04:00 PM #1
Newbie
Joined
Mar 2008
Posts
1
Probability question
Hi I'm new here!
I was looking through an old exam that I totally bombed thinking that I should be able to do it now, but I'm turning up just as clueless. Not knowing the answer is realy bugging me:... | 5 | [
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Central Limit Theorem Approximation
May 12th 2010, 07:05 PM
Janu42
Central Limit Theorem Approximation
The Internal Revenue Services uses a letter-opening machine to remove checks from envelopes. The machine has a probability p=0.03 of failure for any envelope. On a certain day, n=500 envelopes
are independe... | 5 | [
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Patent US4761756 - Signed multiplier with three port adder and automatic adjustment for signed operands
CONTINUATION DATA
The present invention is a continuation of U.S. patent application entitled SIGNED MULTIPLIER, Ser. No. 06/526,106, filed Aug. 24, 1983, now abandoned.
BACKGROUND OF THE INVENTION
The present inv... | 4 | [
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Need help with this initial-value problem
January 31st 2010, 10:42 AM
steph3824
Need help with this initial-value problem
Find the solution of the given initial value problem in explicit form.
y' = x(x²+1) / 4y³, y(0) = -1 /√2
According to my textbook, the correct answer is y= -√((x²+1)/2)
Here is... | 5 | [
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Solutions of an equation
March 22nd 2011, 03:42 AM #1
Member
Joined
Dec 2009
Posts
224
Solutions of an equation
I need some help with the following problem:
(a) Prove that the equation $x^2 + 23y^2 = 41$ does not have solutions in integers.
(b) If (1/3, 4/3) and (9/4, 5/4) are two rational solu... | 5 | [
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Patent US20110054852 - Determination of elbow values for pcr for parabolic shaped curves
BACKGROUND
The present invention relates generally to systems and methods for processing Polymerase Chain Reaction (PCR) data, and more particularly to systems and methods for determining characteristic cycle
threshold (Ct) or elb... | 4 | [
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Patent US4633707 - Method and apparatus for measuring engine compression ratio, clearance volume and related cylinder parameters
This application is a continuation-in-part of application Ser. No. 416,852 filed Sept. 13, 1982, now U.S. Pat. No. 4,505,152.
The present invention is directed to measuring and testing of in... | 4 | [
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0.090... | 15,127 | 15127 | |
Summary: Com S 631: Lower bounds and Separation Results
Lecture 4 Scribe: Ankit Agrawal
1. Time Vs. Space
A turing machine can visit at most t(n) cells in t(n) time. This implies that any deter-
ministic t(n)-time bounded machine can be simulated by a t(n)-space bounded machine.
Can we improve this space bound aymptoti... | 5 | [
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Disjoint Cycle Decomposition
December 5th 2012, 11:52 PM
TheHowlingLung
Disjoint Cycle Decomposition
Label the vertices of a square 1, 2, 3, 4 in counterclockwise order, with 1 being at the top right. The group D4 acts on the vertices as permutations [e.g., r acts as (1234) and s acts as (24)]
and thus also ... | 5 | [
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Evaluate the integral by computing the limit of Riemann sums.
December 3rd 2012, 07:27 PM
JDS
Evaluate the integral by computing the limit of Riemann sums.
I am hoping someone can critique my work and see if I did this problem correctly. Thanks in advance!
NOTE: I have attached a picture file that shows my ... | 5 | [
0.01141357421875,
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0.037109375,
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-0.0947265... | 15,130 | 15130 | |
Find (Z1)(Z2) Leave answer in polar form
July 30th 2008, 08:53 AM #1
Given:
Z1= sqrt.6(cos(5pi/6) + i sin(5pi/6))
Z2= sqrt.2(cos(5pi/4) + i sin (5pi/4))
Find (Z1)(Z2) Leave answer in polar form
This is what i got so far and i don't know if i started right.
=sqrt.12(cos(5pi/6) + i sin(5pie/6... | 5 | [
-0.099609375,
0.04833984375,
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0.046875,
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0.018798828125,
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0.02258... | 15,131 | 15131 | |
Proof: Limits of Sequences
February 26th 2010, 07:22 AM #1
Newbie
Joined
Feb 2010
Posts
6
Proof: Limits of Sequences
Supply a proof for the following theorem: Suppose that f is continuous at a and that x(subscript)n tends to a as n goes to infinity. Then there is an integer N such that f(x(subscript)n) i... | 4 | [
-0.171875,
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... | 15,132 | 15132 | |
ad-bc proof of linear independence
November 9th 2013, 07:16 AM #1
Member
Joined
Aug 2011
Posts
84
ad-bc proof of linear independence
given 2 vectors x1=(a,b) and x2=(c,d), prove that they are linearly independent if and only if ad-bc doesn't equal zero.
I'm familiar with ad-bc as the determinant of a... | 5 | [
-0.10986328125,
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0.02001... | 15,133 | 15133 | |
Find the length of the angle bisector
August 3rd 2012, 05:40 AM #1
Newbie
Joined
Aug 2012
From
Malaysia
Posts
24
Find the length of the angle bisector
ABC is a triangle with AB=8cm and BC=15cm. The line AD bisects the angle $\angle$ BAC
and intersects BC at D. Given that the area of $\triangle$ A... | 5 | [
-0.083984375,
0.057373046875,
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-0.05078125,
0.0529785156... | 15,134 | 15134 | |
Question on null space/column space/row space of a matrix
November 29th 2011, 11:51 AM #1
Junior Member
Joined
Nov 2011
Posts
33
Thanks
1
Could someone please tell me how to answer the questions a, b and c? I really don't know where to start, since the matrix P is not given... Thanks for your help!
... | 5 | [
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... | 15,135 | 15135 | |
Bijection between tangent spaces
December 12th 2010, 08:44 AM #1
Member
Joined
Oct 2010
Posts
131
Bijection between tangent spaces
Hello,
We have defined the tangent space at a point p of a manifold as the set of all derivatives.
Now i want to show, that there exist a bijection between all deriv... | 4 | [
-0.006256103515625,
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... | 15,136 | 15136 | |
Prove rational numbers form a group (associativity - done most of it)
May 29th 2009, 02:59 AM #1
Prove rational numbers form a group (associativity - done most of it)
Q: Prove that the set of rational numbers form a group under the operation * where a * b = 2a + 3b + 4ab
I have to prove (a * b) * c = a * (b ... | 4 | [
-0.059814453125,
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0... | 15,137 | 15137 | |
MathGroup Archive: January 2005 [00568]
[Date Index] [Thread Index] [Author Index]
Solving a weakly singular integral equation
• To: mathgroup at smc.vnet.net
• Subject: [mg53783] Solving a weakly singular integral equation
• From: Za... | 4 | [
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0.125,
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... | 15,138 | 15138 | |
tanding of an
Percentiles: Measure of relative standing of an observation within data
Percentiles are measure of relative standing of an observation within a data. Percentiles divides a set of observations into 100 equal parts, and percentile scores are frequently used to report
results from national standardized tes... | 4 | [
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... | 15,139 | 15139 | |
Another Laurent expansion
May 15th 2010, 02:18 AM #1
Senior Member
Joined
Jul 2006
Posts
364
Another Laurent expansion
Expand $f(z) = \frac{2}{z(z-2)}$ in a Laurent series valid for $|z-2|>0$.
I've tried many things, but the |z-2|>0 thing gets me. Tips?
Ok, I did a substitution $w=z-2$ and got
... | 5 | [
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... | 15,140 | 15140 | |
Physics Forums - ODE Population problem
ODE Population problem
I know that the rate of change with time of a population is proportional to the square root of t. T=0 is y = 100. Population increases at rate of 20 per month.
I started out by trying to do dy/dt = p^.5. I am used to the population problems where I use... | 4 | [
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0.0... | 15,141 | 15141 | |
Runaway Subduction as the Mechanism for the Genesis Flood
KEYWORDS
Runaway subduction, Genesis flood, power-law creep, thermal runaway, catastrophic plate tectonics
ABSTRACT
Experimental investigation of the solid state deformation properties of silicates at high temperatures has revealed that the deformation rate ... | 4 | [
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Envelope and Wavelet Transform for Sound Localisation at Low Sampling Rates in Wireless Sensor Networks
Journal of Sensors
Volume 2012 (2012), Article ID 680383, 9 pages
http://dx.doi.org/10.1155/2012/680383
Research Article
Envelope and Wavelet Transform for Sound Localisation at Low Sampling Rates in Wireless Senso... | 4 | [
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3 Consecutive Odd Integers
December 2nd 2008, 09:42 PM #1
MHF Contributor
Joined
Jul 2008
From
NYC
Posts
1,489
3 Consecutive Odd Integers
What is the largest of three consecutive odd integers if the product of the first and third integers is 6 more than three times the second integer?
Let the la... | 4 | [
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... | 15,144 | 15144 | |
Linear Systems
December 5th 2007, 04:08 PM
sadaf_rehman
Linear Systems
:confused:hey,
i dont understand this question. I tried solve it but i got lost in the middle somewhere. Could you please help me with it, please?
Kareem took 5 hours to drive 470km from Sudbury to Brantford. For part of the trip, h... | 4 | [
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I think the idea is to factor out the x's
September 4th 2011, 10:53 AM #1
Senior Member
Joined
Jul 2008
Posts
313
I think the idea is to factor out the x's
I have to equations;
x - 2 / 3, and 2x / 7
I need to solve for x?
First I multiply the denomintors;
3(x - 2) = 7(2x)
next I ... | 4 | [
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Common Divisor
June 6th 2010, 09:13 AM
novice
Common Divisor
An integer $n>1$ has the properties that $n|(35m+26)$ and $n|(7m+3)$ for some integer $m$, what is $n$?
My solution is as follows:
Let $n>1$ and $n|(35m+26)$ and $n|(7m+3)$, where $n \in \mathbb{N}$ and $m \in \mathbb{Z}$. Then
$(35m+26)... | 5 | [
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Basic Question. Why does 5x/10 = 5/10 * 5 ?
February 9th 2013, 07:38 AM #1
Newbie
Joined
Dec 2012
From
uk
Posts
5
Basic Question. Why does 5x/10 = 5/10 * 5 ?
So I am doing an equation for straight line graphs and one of the expressions simplified out to:
5x/10.
It then said this could simply... | 4 | [
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0.053955078... | 15,148 | 15148 | |
The avarage of {a(n)}
May 18th 2010, 08:13 PM
elim
The avarage of {a(n)}
We know that if real sequence $\left\{a_n\right\}$ converges, then $\lim_{n \to \infty} (a_{n+1}-a_n) = 0$ and $\left\{ \frac{a_1+\cdots + a_n}{n}\right\}$ converges.
Suppose $\lim_{n \to \infty} (a_{n+1}-a_n) = 0$ and $\left\{ \frac{a... | 5 | [
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... | 15,149 | 15149 | |
cos 1 deg. + cos 3 deg. + cos 5 deg.+ ... + cos 177 deg. + cos 179 deg.
December 4th 2010, 04:07 AM #1
cos 1 deg. + cos 3 deg. + cos 5 deg.+ ... + cos 177 deg. + cos 179 deg.
Can anybody
Find the sum of
cos 1 deg. + cos 3 deg. + cos 5 deg.+ ... + cos 177 deg. + cos 179 deg.
Last edited by mr fantast... | 5 | [
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Basic Algebra Tutorial - GNU Emacs Calc Manual
3.5.1 Basic Algebra
If you enter a formula in Algebraic mode that refers to variables, the formula itself is pushed onto the stack. You can manipulate formulas as regular data objects.
1: 2 x^2 - 6 1: 6 - 2 x^2 1: (3 x^2 + y) (6 - 2 x^2)
. ... | 5 | [
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Wavelength, Frequency, and Planck's Constant
Soaring Crane
1) What is the wavelength (in meters) of an electromagnetic wave of frequency 2812571875.00MHz?
Example: 1.11e-5
LAMBDA = c/v
=(3.00*10^8 m/s)/(2812571875.00MHz*10^6 Hz/MHz) = 1.07E-7 m??
If your text
does
give constant
c
to more significant digits, I wou... | 4 | [
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-0.05078... | 15,152 | 15152 | |
Grade my continuity proof
October 25th 2010, 07:50 AM #1
Member
Joined
Oct 2010
Posts
133
Grade my continuity proof
Prove that if $f:R\rightarrow R$ is continuous and $f(x+y)=f(x)+f(y)$ for all $x,y\in R$, then there is a contstant $c\in R$, such that $f(x)=cx$, for all $x\in R$.
Here is my attempt:... | 5 | [
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Brevet US5724573 - Method and system for mining quantitative association rules in large relational tables
FIELD OF THE INVENTION
The present invention generally relates to data processing. In particular, the invention relates to methods and apparatus for mining quantitative association rules in large relational tables... | 4 | [
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Mathematics - a new basis
February 15th 2013, 05:01 AM #9
Member
February 14th 2013, 10:58 PM #8
Junior Member
February 14th 2013, 03:24 AM #7
Junior Member
February 12th 2013, 10:38 PM #6
Junior Member
February 12th 2013, 12:53 PM #5
MHF Contributor
February 11th 2013, 11:38 PM #4
Junior Member
February 11... | 4 | [
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Flatland on a sphere.Find the radius
Others mentioned the angle excess formula, so I won't repeat that.
Lets say the sphere is large and you can only access a small part of the sphere. Lets also assume that you have no direct method to measure area. (Can anyone suggest an accurate method to measure
area without alread... | 4 | [
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Cross Product Problem
September 9th 2011, 04:58 PM #1
Member
Joined
Oct 2010
Posts
150
Cross Product Problem
Basically, I've drawn the diagram and considered the fact that the geometric definition of the cross product is: U x V = |u||v|sin(theta).
Given that the angle between them is pi/6, then sin... | 5 | [
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σ sum of divisors proof
November 29th 2009, 09:08 PM #1
Newbie
Joined
Oct 2009
Posts
24
σ sum of divisors proof
σ is an odd integer if and only if n is a perfecdt square or twice a perfect square.
[Hint: If p i s an odd prime, then 1+p+p^2+...+p^k is odd only when k is even]
Could you please ex... | 4 | [
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ball
Balls, description and air effects.
Last updated on 14 May/98
ball weight (lb) diameter(in) terminal speed(mi/hr) Cor at 15 mi/hr CoR at 55 mi/hr
16 lb shot 16 4.72 325
football 0.91 11.1 x 6.8 100
baseball .32 2.9 95 ... | 5 | [
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double integral in polar coordinates, cant figure out how to find the limits of theta
April 19th 2012, 06:06 PM
AlmostFreed
double integral in polar coordinates, cant figure out how to find the limits of theta
Just trying to find what theta is between for the boundary (x^2)+(y^2)-y=0 in polar coordinates
th... | 4 | [
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Electrostrictive Mechanism of Radiation Self-Action in Nanofluids
Advances in Condensed Matter Physics
Volume 2013 (2013), Article ID 591087, 5 pages
http://dx.doi.org/10.1155/2013/591087
Research Article
Electrostrictive Mechanism of Radiation Self-Action in Nanofluids
^1Mathematics Department, Far Eastern State Tr... | 4 | [
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Proving the Differential of the Function
November 28th 2010, 01:43 AM #1
Junior Member
Joined
Oct 2010
Posts
61
Proving the Differential of the Function
be f(x) Continuous function in [0,2] , and Differentiable in (0,2).
0<f(1)<f(0)<f(2).
Prove that the Differentiable become zero in any point in... | 5 | [
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Using Logarithms to solve for x (form a^x.b^y)
Hi there, if someone could please help me solve this problem I'd be most grateful: 2^x-3 . 5^x+1 = 62.5
I am unsure of how your problem reads, but I think it is this...Please use () in the future. $2^{x-3}\cdot 5^{x+1}=62.5$ First multiply both sides by $2^4=16$ This give... | 4 | [
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Improper Integral Help
November 6th 2011, 08:26 PM
masteroc
Improper Integral Help
Just needed a bit of confirmation that I was doing this problem correctly. I started off using a table definition that you can see at the bottom of that picture. The part that got cut off just
shows: u/a^2sqrt(u^2+a^2). After ... | 5 | [
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Proof by Induction?
May 14th 2009, 05:12 AM #31
Thats why i called his inequalities ingenious!! I think getting it is an art
I was trying to bound it between squares of two consecutive numbers initially.. But I could not get it
sorry i took long to reply i didn't realise it went on to a new page...
... | 5 | [
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Suppose f is differentiable at a.
November 12th 2006, 07:30 PM
Swamifez
Suppose f is differentiable at a.
I am still contemplating over this proble, so if anyone is out there who can help me thanks. Suppose that the function f is differentiable at a. Prove (without
quoting a theorem) that f 2 is differentiable... | 5 | [
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please help with this sphere problem..
August 10th 2010, 12:35 PM #1
Junior Member
Joined
Aug 2010
Posts
49
please help with this sphere problem..
One balloon had a volume of 108pi/3 cubic metres.
a.what was the diameter of the balloon?
b.The formula for the volume of a sphere is 4/3(pi)(r^2)
... | 4 | [
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Find the equation of the tangent line to the curve ..
December 16th 2010, 11:47 AM #1
Junior Member
Joined
Mar 2010
Posts
56
Find the equation of the tangent line to the curve ..
A) y = e^(-x) @ x = -1
dy/dx = (-1)(1)(e^(-x))
= -e^(-x)
f'(-1) = -0.368
f(-1) = 0.368
y =mx+b
0.36... | 5 | [
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Need help with Factoring and Solving Equations.
January 10th 2011, 09:08 PM #1
Newbie
Joined
Jan 2011
Posts
6
Hi! Ive been trying to do these problems for a while and Im stumped. I finished 13 problems and fully understand them , but I don't know how to do these problems. It would be nice if you could
... | 4 | [
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Upward vertical movement with air drag.
May 19th 2011, 05:56 AM
bartroels
Upward vertical movement with air drag.
\hat{} Hi, here's the problem: "upward vertical movement with air drag"
speed = v; initial speed at t0 = v0; initial height x0 = 0
x= vertical distance travelled
force gravity Fg=-m.g
... | 4 | [
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0.00130462646484... | 15,170 | 15170 | |
J Bessel function of the first kind
Article 11 — Appendix A.34
J Bessel function of the first kind
1. Definition
By definition Bessel function is solution of the Bessel equation
z^2 w′′ + z w′ + (z^2 − ν^2) w = 0
As second order equation it has two solutions, first of which has no singularity at 0 and is calle... | 4 | [
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... | 15,171 | 15171 | |
algebra equations hw
• algebra equations hw
could you please help me on these algebra question and show your working so i can see how you did it thanks you =)
1 6(3t-2)+4(t-5) = 78
2. 4(5x+3)-5(2x+1) = 27
3. 3(6y-1) =7 (2y+3)
•
Quote:
━━━━━━━━━━━━━━━━━━━━━━━━━━... | 4 | [
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Legendre Symbol
Evaluate the Legendre symbol below: (461/773) Show all work/theorems used to compute it.
Note 461 = 1 (mod 4). Quadradic Reciprocity: (773/461) = (312/461) = (8/461)*(3/461)*(13/461) =(2/461)*(3/461)*(13/461) Theorem 2 (2/p)=1 iff p=1,7(mod 8) for odd primes p. Use theorem, (-1)*(3/461)*
(13/461) Theor... | 5 | [
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-0.0... | 15,173 | 15173 | |
Words problem nr2
October 27th 2012, 07:43 AM
Petrus
Words problem nr2
361 students at a university has taken a course in the analysis, 223 have taken a course in discrete mathematics, and 188 have read both courses. How many students at the university have taken a
course in either analysis or discrete mathe... | 4 | [
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... | 15,174 | 15174 | |
prove that [0,1] is compact?
April 5th 2011, 02:51 AM #1
Newbie
Joined
Feb 2011
Posts
22
prove that [0,1] is compact?
Using Tychonoff's theorem, prove that [0,1] is compact.
Should i present [0,1] as a product of compact spaces? is that possible? if so how can I do it?
any help is appreciated!
... | 4 | [
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0.0... | 15,175 | 15175 | |
Galilean transform and the maxwell equations
To elaborate on what Tim is saying: once you get into relativity and EM, it's helpful to get used to the idea that the EM field isn't a simple vector field. Rather, just as a vector field is a
combination of directions, there are bivector fields which are combinations of pla... | 4 | [
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-0.09033... | 15,176 | 15176 | |
poker probability
October 27th 2012, 01:18 PM #1
Newbie
Joined
Oct 2012
From
Louisiana
Posts
2
poker probability
In order to find the probability of dealing a full house in a 5 card poker hand, you use the folowing:
(13-choose-1)x(4-choose-3)x(12-choose-1)x(4-choose-2) / (52-choose-5)
But in... | 4 | [
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Wonderful Calculus Quiz problem
November 3rd 2008, 08:17 AM #1
Newbie
Joined
Nov 2008
Posts
1
Wonderful Calculus Quiz problem
Hope someone can figure this one out because I am LOST. THANK YOU!!
Find the function f(t)=ce^(kt) that passes through the given points in the plane.
A) (0,5) and (1,1)
... | 4 | [
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Compare two tables in excel: Remove common rows
Table of Contents
Let me demonstrate how to extract non common records from two tables. The formulas in this post contains the COUNTIFS function and is introduced in excel 2007.
The first example shows you how to hide common rows in a table. The second example describe... | 5 | [
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0.001083... | 15,179 | 15179 | |
Physics Forums - View Single Post - States of a spin 1/2 particle in a magnetic field
Well, the magnitude of the vectors seems to be 1. After all, |(1 0)|
^2
is 1. So that would be okay?
For the second question I used the Pauli-spinmatrix of S
[x]
:
Then, I can use det(S
[x]
-lambda*I) = 0 to get lambda
^2
-... | 4 | [
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... | 15,180 | 15180 | |
Analytical Solutions for the Mathematical Model Describing the Formation of Liver Zones via Adomian’s Method
Computational and Mathematical Methods in Medicine
Volume 2013 (2013), Article ID 547954, 8 pages
http://dx.doi.org/10.1155/2013/547954
Research Article
Analytical Solutions for the Mathematical Model Describi... | 5 | [
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MathGroup Archive: July 2011 [00464]
[Date Index] [Thread Index] [Author Index]
Re: Inverse of Interpolating Function?
• To: mathgroup at smc.vnet.net
• Subject: [mg120407] Re: Inverse of Interpolating Function?
• From: Daniel Lichtbl... | 5 | [
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Patent US7308148 - Method of compressing digital ink
TECHNICAL FIELD
The present invention relates to methods of compressing digital ink and in particular, to compression methods using linear predictive encoding schemes.
BACKGROUND ART
The growth in use of portable pen-based computing devices, such as PDAs, has resu... | 4 | [
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0.0214843... | 15,183 | 15183 | |
I need help setting up these equations for using shell method to find volumes.
May 10th 2009, 04:53 PM #1
Newbie
Joined
May 2009
Posts
2
I need help setting up these equations for using shell method to find volumes.
i am trying to make up my own equations for shell method and completely forgot how to do ... | 4 | [
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arctan/arcsin and integration by substitution
October 20th 2011, 11:51 PM
terrorsquid
arctan/arcsin and integration by substitution
$\int \frac{1}{\sqrt{81-x^2}}~dx$
I know I need to use substitution and I am aware of the fact that $\frac{1}{\sqrt{1-x^2}}$ = derivative of arcsin(x), but I am unsure how I ap... | 5 | [
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General Solution of PDE using Fourier's method
October 17th 2009, 08:39 PM #1
General Solution of PDE using Fourier's method
Hello,
Can someone please have a look at this problem and tell me if I have answered it correctly (I do get the solution so I'm more concerned about the process being correct).
Sho... | 5 | [
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Disjoint Sets
Disjoint sets - have no elements in common.
For example, the sets of alive and dead people are disjoint.
Suppose n items (student records, bank account records, whatever) each with unique keys from 1..n.
Keep the items in a collection of sets (disjoint sets) such that an ite... | 5 | [
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0.00263977050781... | 15,187 | 15187 | |
Step input to loaded transformer
I am trying to calculate the response of a loaded ideal transformer to a step input. For example a step input in voltage from zero on the primary coil with a resistor connected across the secondary
coil.
I already understand that with the second coil disconnected (for all practical pur... | 4 | [
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Another equation
Here's another one I'm having problems with. The equation given is
$S = \pi r\sqrt{r^2 + h^2}$
and you are supposed to solve for h.
I attacked it by
$S^2 = \pi^2r^2(r^2 + h^2)$
then
$\frac{S^2}{\pi^2r^2} = r^2 +h^2$
then
$\frac{S^2}{\pi^2r^2}-r^2=h^2$
and fin... | 4 | [
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trying to get right answer on derivative
February 5th 2013, 01:51 PM #1
Member
Joined
Sep 2011
Posts
75
trying to get right answer on derivative
so the answer is s/b (should be) on lower right, no idea how they got there, anyone know where I went wrong, thanks?
Re: trying to get right answer on der... | 5 | [
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-0.02331542... | 15,190 | 15190 | |
A novel fast phase correlation algorithm for peak wavelength detection of fiber Bragg grating sensors
« journal navigation
A novel fast phase correlation algorithm for peak wavelength detection of fiber Bragg grating sensors
Optics Express, Vol. 22, Issue 6, pp. 7099-7112 (2014)
http://dx.doi.org/10.1364/OE.22.00709... | 4 | [
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Confusion Analysis and Detection for Workflow Nets
Discrete Dynamics in Nature and Society
Volume 2014 (2014), Article ID 825313, 14 pages
http://dx.doi.org/10.1155/2014/825313
Research Article
Confusion Analysis and Detection for Workflow Nets
School of Electro-Mechanical Engineering, Xidian University, Xi’an 71007... | 4 | [
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... | 15,192 | 15192 | |
Quadratic Residues
May 6th 2007, 10:47 AM
math19091
Quadratic Residues
We know that there are always 2 consecutive quadratic residues of p if p >= 7 (and p is a prime).
1.) Show this is true for two diff. primes >= 7
2.) Prove why this true. (Hint: you will first want to show that at least one of 2, 5,... | 4 | [
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0.0092773437... | 15,193 | 15193 | |
Geometry problems
November 23rd 2012, 07:48 PM
chubakueno
Geometry problems
Hello everyone! I'm getting stuck at this problem and I dont know how to solve it. I'm just curious about it. Any help will be greatly appreciated
Attachment 25877
November 24th 2012, 03:59 AM
BobP
Re: Geometry problems
Could... | 5 | [
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Integral Help
May 7th 2008, 11:26 PM #1
Newbie
Joined
May 2008
Posts
2
Integral Help
I have the following integral i cant find the solution.
I have tried differents ways to solve but nothing.
a is constant and it will take values on the interval [0,1]
Thanks in advance.
Hi
$\sqr... | 5 | [
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Math Help
January 25th 2009, 08:40 AM #1
Newbie
Joined
Oct 2008
Posts
19
Trig
A ball is thrown verically upward from the balcony of an apartment building. The ball falls to the ground the height of the ball, h metres, above the ground after t seconds is given by the
function: h(t)= -5t^2+15t+45
... | 4 | [
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Math Help
Last edited by Krizalid; January 29th 2009 at 10:17 AM.
That's algebra! $\forall a\in G_1,\forall (x,y)\in G,\ (x,y)(a,e_2)(x,y)^{-1}=(x,y)(a,e_2)(x^{-1},y^{-1})$$=(xax^{-1},ye_2y^{-1})=(xax^{-1},e_2)$ $a,x\in G_1 \Rightarrow xax^{-1}\in G_1 \Rightarrow
(xax^{-1},e_2)\in N$ Therefore $N$ is a normal subgrou... | 5 | [
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Proving alternative definition of the difference quitient?
September 2nd 2010, 11:15 AM #1
Proving alternative definition of the difference quitient?
Okay, so I'm not asking for somebody to do this problem for me, I've done the work. I was just wondering if somebody could look over my proof and tell me weather it... | 5 | [
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... | 15,198 | 15198 | |
[SOLVED] induction with multiples
August 10th 2009, 02:03 PM #1
Junior Member
Joined
Dec 2008
Posts
70
[SOLVED] induction with multiples
how to prove this
$5^{2n}-3^n$ when $n\geq0$
i do the base step of proving it works for 0
$5^{2(0)}-3^0$
$=0$ and $0\times11=0$ zero is a multiple o... | 4 | [
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