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Patente US6891889 - Signal to noise ratio optimization for video compression bit-rate control BACKGROUND 1. Field This disclosure relates to video compression, more particularly to methods of rate control in video compression. 2. Background Digitization of video sequences allow for easy transmission of these sequen...
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Rectangle Inscribed inside a Semicircle (w/ picture) April 13th 2012, 04:11 PM #1 Newbie Joined Apr 2012 From Cali Posts 20 Rectangle Inscribed inside a Semicircle (w/ picture) I am not good with these certain types of problems. It has 3 parts to the question: A) Verify that A(theta)=25sin2(thet...
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Patent US5583954 - Methods and apparatus for fast correlation REFERENCE TO APPENDICES The disclosure of this patent document contains material which is subject to copyright protection. The owner thereof has no objection to facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears ...
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Patent US6621721 - Direct conversion programmable power source controller: three-phase input with programmable single-phase output RELATED APPLICATION This application is a continuation-in-part of the application currently pending Ser. No. 10/062,054 and filed on Jan. 31, 2002. FIELD OF THE INVENTION This invention ...
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Patent US7751591 - Dominant motion analysis BACKGROUND TO THE INVENTION This invention concerns a method for estimating a dominant motion between frames in sequences of images or video sequences. Practical applications include camera image stabilisation, video coding and standards conversion. PRIOR ART Efficient est...
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The Systems of Nonlinear Gradient Flows on Metric Spaces and Its Gamma-Convergence Abstract and Applied Analysis Volume 2012 (2012), Article ID 910406, 18 pages http://dx.doi.org/10.1155/2012/910406 Research Article The Systems of Nonlinear Gradient Flows on Metric Spaces and Its Gamma-Convergence Department of Math...
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Differentiating a function with a Heaviside Step Function March 30th 2008, 05:38 AM glio Differentiating a function with a Heaviside Step Function The function H(x) defined by $H(x) = 0$$, x < 0$ $H(x) = 1/2$$, x = 0$ $H(x) = 1$$, x > 0$ $F(x) = f(x)H(x - b)$ Find the conditions on $f(x)$ t...
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pumping out a liquid - work March 11th 2010, 04:37 PM #1 pumping out a liquid - work A tank in the shape of an inverted right circular cone has height Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. Note: the density of hot chocolate is $<br /> A = \pi r^2<...
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Hanging Object Tension 1. The problem statement, all variables and given/known data A light rope is attached to a block with mass 3.70kg that rests on a frictionless, horizontal surface. The horizontal rope passes over a frictionless, massless pulley, and a block with mass m is suspended from the other end. When the b...
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Fort Space Topology February 16th 2010, 11:53 AM #1 Member Joined May 2008 Posts 140 Fort Space Topology For the Fort space topology, let $(a_{n})$be a sequence in X, such that the set of the sequence, $\{a_{n}:n\in\mathbb{N}\}$, is infinite. Using the definition of convergence in topological space,...
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prove of equation with complex numbers October 17th 2009, 07:23 AM #1 Newbie Joined May 2009 Posts 11 prove of equation with complex numbers Here is the equation to prove: $|a-b|^2=|a|^2-2 re \hat{a} b+|b|^2$ I tried with something like this: $|z|^2=z \hat{z}$ $z+\hat{z}=2rez$ but i s...
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Marginal pdf of 2 dimensional random variables November 17th 2011, 12:15 PM #1 Junior Member Joined Nov 2011 Posts 27 Marginal pdf of 2 dimensional random variables Hi everybody, Given is the following joint distribution of the 2-dimensional random variable (X1,X2). f(x1,x2)=(1/(2*x1); if 0<x2<...
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Can some one check my work? Related Rates The problem is: For the baseball diamond in exercise 33, suppose the player is running from first to second at a speed of 28 feet per second. Find the rate at which the distance from home plate is changing when the player is 30 feet from second base. (the picture basically sh...
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ball bouncing forever August 20th 2009, 07:22 AM dat1611 ball bouncing forever A ball drops from a height of 14 feet. Each time it hits the ground, it bounces up 35 percents of the height it fall. Assume it goes on forever, find the total distance it travels. can anyone help me set this one up August 20th ...
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Simulation of Compressed Air Driven Piston I suppose this is a lot to ask in one post, but I have made a start on this. I will run through the sequence of events and describe the formulas I have, or have identified so far. The process begins with a hammer striking a valve to open the seal. This can be modeled as a col...
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complex analysis February 6th 2010, 07:57 PM #1 Member Joined Sep 2008 Posts 166 complex analysis Suppose A and B are nonempty closed bounded subsets of $\mathbb{C}$. 1. Show that there exist $a_0 \in A, b_0 \in B$ such that $|a_0-b_0|=\inf\{|a-b|:a\in A, b\in B\}$. 2. Show that this is not true ...
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Thermodynamics: calculate q, w, E,H,S for a 5 step process I need to calculate q, w, [tex]\Delta E[/tex], [tex]\Delta H[/tex] and [tex]\Delta S[/tex] for the process of heating a sample of ice weighing 18.02 g (1 mole) from -30.0 °C to 140.0°C at constant pressure of 1 atm. Given are the temperature independent heat ca...
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chi-square and normal distribution October 24th 2010, 06:20 PM #1 Member Joined Sep 2009 Posts 100 chi-square and normal distribution Hi. I have this problem. Making use of the fact that the chi-square distribution can be approximated by a normal distribution when $v$, the number of degrees of f...
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Some theorem regarding rational numbers Ed Quanta If y>x where x and y are both elements of the reals, but x is also irrational, I must prove that there is a rational number z such that x<z<y. I can only show this is true when x is rational. How do you add something to an irrational number to make it rational? Here's...
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Basic factoring question May 29th 2008, 07:45 AM #1 Junior Member Joined May 2008 Posts 50 Basic factoring question Hi, my factoring is not too good. How do I factor this and solve for 0?: x^2 + 2x + 2 = 0 Thanks, Kim Since there are not factors of $2=2\cdot 1$ that add up to two. This...
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Three same-mass freight cars, why force on each is not same ? QUESTION three cars of mass m are pulled with force F by a locomotive. Find forces on each cars ? assuming the force F is exerted on car C and nearest to C is car B and remaining one is A. [tex]\vec{F}_{A}[/tex] is total sum of all (interbody-) forces on c...
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Semiconservative Systems of Integral Equations with Two Kernels International Journal of Mathematics and Mathematical Sciences Volume 2011 (2011), Article ID 917951, 11 pages http://dx.doi.org/10.1155/2011/917951 Research Article Semiconservative Systems of Integral Equations with Two Kernels Institute of Mathematic...
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Muon decay calculation Please, I'd need some help. Although I am not sure if this is again the correct thread, but since it concerns muon decay I bring it here. So... I am trying to find out why the differential below, in spherical cordinates becomes: [itex]d^{3}p_{\bar{v_{e}}}=-\frac{E_{\bar{v_{e}}} E_{v_{μ}}}{E_{e}}...
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Continuous Random Variable Question June 16th 2011, 07:38 AM #1 Member Joined Dec 2010 Posts 107 Continuous Random Variable Question Let U and V be independent and identically distributed uniformly on the interval [0,1]. Show that for 0<x<1: $P(x<V<U^2)=\frac{1}{3}-x+\frac{2}{3} x^{\frac{3}{2}}$. So...
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Finding Area between Parabolas July 4th 2012, 07:06 AM #1 Newbie Joined Jul 2011 Posts 6 Finding Area between Parabolas The question is: A shape has been formed by three intersecting parabolas, the equations of these parabolas are: 1. $y=-x^2-6x-9$ 2. $y=x^2-4.5$ 3. $y=-x^2+6x-9$ U...
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percentiles... UGH June 11th 2008, 07:06 PM #1 Newbie Joined May 2008 Posts 13 percentiles... UGH A student's score on an SAT was 700 on a standardized test known to have a mean of 500 and a standard deviation of 110. a) what percentile was the student in? b) what score must a student get to be ...
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rate/water level word problem March 27th 2008, 05:25 PM shepherdm1270 rate/water level word problem a trough has a triangular cross section. The trough is 6 ft across the top, 6 ft deep, and 16 ft long. Water is being pumped into the trough at the rate of 4ft^3 per minute. Find the rate at which the height o...
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A-(-b)=a+b How to prove Dick Yes. Your axiom 3 is is using multiplicative notation instead additive. I'd write it as ∀a∈G ∃(-a)∈G : a+(-a)=0. And for 2 substitute 0 for e. So sure, since a+(-a)=0, an inverse -(-a) of (-a) is a. That's almost Q.E.D. If you want to go whole hog on this your axioms don't explicitly sta...
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Work in irreversible process? What matters is if the process is quasistatic or not. Quasistatic means that the process proceeds slow enough for internal thermodynamic equilibrium to be maintained. If the irreversible process is quasistatic then the work done is given by the integral of P dV. Consider e.g. an ideal ga...
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How to set this volume problem? April 6th 2009, 11:39 AM #1 Member Joined Dec 2008 Posts 228 How to set this volume problem? Let V be the volume of the region bounded between two expanding concentric spheres. at time t = 0 the spheres have radii of 6 cm and 40 cm. The radius of the smaller sphere is incr...
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Patent US5412754 - Reverse time delay neural network for pattern generation TECHNICAL FIELD This invention relates to pattern generation and, more particularly, to computation networks trajectory generation and time-series prediction including on-line, real-time prediction. BACKGROUND OF THE INVENTION Adaptive solut...
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pythagoras May 28th 2008, 04:51 AM simonmann pythagoras the lengths, in centimetres, of the sides of a right-angled triangle are: x, x+2 and x+5 i) use pythagoras' theorem to write down an equation in x. show that it simplifies to x^2-6x-21=0 ii) solve the equation iii) write down the lengt...
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Pythagoras' Theorem February 20th 2007, 01:20 AM #1 Newbie Joined Feb 2007 Posts 17 Pythagoras' Theorem A right angle has a hypotenuse of 47.3cm and one other side of 30.8cm. Find the area of the triangle. Thank You P.S. Could you please tell me the formula I should use for this ? Pythagoras' Theor...
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calc 1 question question is f(3) =2, f'(3)=4 g(3)=8 g'(3)=3 Find h'(3)=fx/gx does this relate to dy/dx=dy/du*du/dx....? Hello, weezie23! I'm guessing that you left out part of the problem. Quote: $f(3) \:=\:2,\quad f'(3)\:=\:4,\quad g(3)\:=\:8,\quad g'(3)\:=\:3,\quad h(x) \:=\:\frac{f(x)}{g(x)}$ Find $h'(3)$ We have: ...
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Help to prove each Identity November 10th 2009, 09:19 AM #1 Newbie Joined Nov 2009 Posts 1 Help to prove each Identity I have no idea how to solve these problems, any help wold be aprreciated a) tanθ - 1 = (sin^2θ - cos^2θ) / (sinθcosθ + cos^2θ) b) sinx + sinxcot^2x = cscx Hello, AdamEdwar...
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Reduction of order, dependent variable missing trouble February 26th 2013, 06:06 AM KarlKarlJohn Reduction of order, dependent variable missing trouble Hi I've been having trouble with a reduction of order problem from my textbook. By making the appropriate substitutions of $u=y'$$u' = y''$ for the missing depen...
5
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[SOLVED] Transofrmation Vector May 10th 2009, 11:36 AM #1 Newbie Joined Jan 2009 Posts 21 [SOLVED] Transofrmation Vector Hi, The Question: A transformation $x \rightarrow Ax$ sends vector $(1,0)^T$ to $(3,-2)^T$ and vector $(0,-1)^T$ to $(2,-1)^T$. What is $A$? Find the inverse of $A$. Th...
5
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Approximate Hamiltonian Symmetry Groups and Recursion Operators for Perturbed Evolution Equations Advances in Mathematical Physics Volume 2013 (2013), Article ID 568632, 9 pages http://dx.doi.org/10.1155/2013/568632 Research Article Approximate Hamiltonian Symmetry Groups and Recursion Operators for Perturbed Evoluti...
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Simplify [√(3+√5) + √(4-√15)] / [√(3+√5) - √(4-√15)] Simplify $<br /> \frac{\sqrt{3+\sqrt{5}} + \sqrt{4-\sqrt{15}}} {\sqrt{3+\sqrt{5}} - \sqrt{4-\sqrt{15}}}$ EDIT: Perfect! Hello, mathwizard! Quote: Simplify: . $<br /> \frac{\sqrt{3+\sqrt{5}} + \sqrt{4-\sqrt{15}}} {\sqrt{3+\sqrt{5}} - \sqrt{4-\sqrt{15}}}$ Those expres...
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Functions s.t. f(x+y) = f(x) + f(y)? February 3rd 2010, 08:00 PM #1 Junior Member Joined Nov 2009 Posts 27 How can find all real continuous functions s.t. f(x+y) = f(x) + f(y), and prove it? So far I've tried to do it by a process of elimination, leaving only functions of the form f(x) = ax and the tr...
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Vector October 6th 2012, 11:53 AM alexander9408 Vector A straight line is given as 2(x+4) = -2(y-5) = -3(z-6), (a)determine the vector equation of the straight line. The answer I found is r = -4i +5j +6k + t(3i -3j +2k), is this correct? (b)find the coordinate of a point Q that lies at the straight line...
4
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using the quadratic formula August 25th 2009, 05:33 AM #1 Newbie Joined Aug 2009 Posts 6 using the quadratic formula Use the quadratic formula to solve the equation x^2 - x = -7 x^2 - x + 7 = -7 + 7 x^2 - x + 7 = 0 a= 1, b= -1, c= 7 - (-1) + or - sqrt (-1)^2-4(1)(7)/2(1) 1 +...
4
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The Global Weak Solution for a Generalized Camassa-Holm Equation Abstract and Applied Analysis Volume 2013 (2013), Article ID 838302, 6 pages http://dx.doi.org/10.1155/2013/838302 Research Article The Global Weak Solution for a Generalized Camassa-Holm Equation Department of Applied Mathematics, Southwestern Univers...
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Efficiency and the Euclidean Algorithm 1. Question Let b = r_0, r_1, r_2,... be the successive remainders in the Euclidean algorithm applied to a and b. Show that every two steps reduces the remainder by at least one half. In other words, verify that r_(i+2) < (1/2)r_i for every i = 0,1,2,... 2. Attempt at a solution...
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Algebrarules.com Algebra Rules for Arithmetic 2 ``` a\left({b \over c}\right) = {ab \over c} ``` Any multiplication or division of the numerator of a fraction applies to the fraction as a whole, and vice versa: if you need to multiply a fraction, multiply the numerator and your aim is achieved ```6\left({1 \o...
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Nilpotent Elements of Residuated Lattices International Journal of Mathematics and Mathematical Sciences Volume 2012 (2012), Article ID 763428, 9 pages http://dx.doi.org/10.1155/2012/763428 Research Article Nilpotent Elements of Residuated Lattices ^1Department of Mathematics, Bam Higher Education Complexes, Kerman,...
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Trigonometric simplification November 11th 2007, 09:22 PM #1 Member Joined Oct 2007 Posts 178 Trigonometric simplification I worked a derivative problem all the way down to this: $\frac {-csc^2 x}{(cot + 1)^2}$ Answer: $\frac {-1}{(sinx + cosx)^2}$ I'm pretty sure there is a way to simplif...
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Laurent Series June 17th 2007, 05:10 AM #1 Member Joined Jun 2007 Posts 131 Laurent Series Hi all I'm trying to get my head around the Laurent series for the following function : f(z) = zsinh(1/z+1) about -1 and trying to give the general term of the series for odd and even powers of (z+1)...
5
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Basic Operations with polynomials June 30th 2008, 03:15 PM #1 Newbie Joined Jun 2008 Posts 13 Basic Operations with polynomials Ok i havent done these in a looong time and i need someone to refresh my memory lol which of the following expressions represents the product of 3 less than twice x and 2 m...
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Markov's Inequality Problem Help! MIDTERM MONDAY! November 17th 2007, 03:20 PM clipperdude21 Markov's Inequality Problem Help! MIDTERM MONDAY! Let X be uniformly distributed over (1,4) (a) Use Markov's inequlaity to estimate P(x>=a) a is between 1 to 4 and compare this result to the exact answer. (b) F...
5
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Design Considerations of Toroid Transformers and other magnetic devices Ferrite toroid transformers provide an often convenient and very effective shape for many wide band, pulse and power transformers and inductors. The continuous magnetic path yields the highest effective permeability and lowest flux leakage of any s...
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Equilibruim points poincare map September 8th 2009, 12:54 PM #1 Newbie Joined Aug 2009 Posts 10 Equilibruim points poincare map Hello, I really need help with this problem! Got a big exam tomorrow and this type of problem is one I struggle with the most. Desperate for all any help. See attached ...
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Factoring trinomials December 5th 2006, 04:50 PM Soroban Factoring trinomials This method of factoring trinomials was shown to me . . by one of my students many years ago. You may find it as fascinating as I did. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Example: $6x^2 - 3...
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Volumes of Regions with Known Cross Sections November 2nd 2009, 10:27 PM RockHard Volumes of Regions with Known Cross Sections Find the volume of the solid bounded by the curves y = x^2 and y = 8 - x^2 who cross sections are perpindicular to the x - axis with one side on the xy plane using semi circle cross sect...
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Patent US6145112 - Error correcting method and apparatus BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an error correcting method and apparatus for correcting errors that arise in digital equipment or digital communications. 2. Description of the Prior Art To correct errors ...
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Simple proof involving groups I'm just playing around here to reduce the number of things we have to prove. We know x has a left inverse y. What is xyx? It is x(yx)=x, and it is (xy)x, thus if we could show that the e in 3 was unique, we'd have xy=e, and x would have a right inverse. So we just have to show that fx=x ...
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Help Simplifying! I need help with this. The problem needs to be simplified and I'm confused: ln [(e^5x)/x(x^4+1)] Thanks! nerd :P Well Bandnerd...I am going to assume that this is yoru problem $\ln\bigg[\frac{e^{5x}}{x(x^4+1)}\bigg]$...if so then we begin with this $ln(e^{5x})-ln(x(x^4+1))$ due to the fact that the q...
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The Eigenvector of a Transpose Problem March 26th 2013, 02:22 AM #1 Newbie Joined Mar 2013 From England Posts 3 Let S $\in$ M[nxn](R) and D $\in$ M[nxn](R) be n $\times$ n matrices such that D^TSD = S where S is non degenerate. Let $\mu eq 0$ be an eigenvalue of $D$ with eigenvector x. (i)...
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This appears to be in direct violation of Carmichael's theorem. In an attempt to prove a statement about the residues of a certain sequence mod ##10^n##, I've derived something which seems to be in direct violation of Carmichael's theorem. Of course, this can't be right, so can someone either explain what bit of my rea...
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simultaneous equations problem January 25th 2010, 04:18 PM sillylilly simultaneous equations problem for what value of a is there no unique solution for the following ? 3x - 2y = 5 5x + ay = 4 January 25th 2010, 08:09 PM TKHunny There are two answers, here. 1) No solution AT ALL, certainly w...
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Patent US4640136 - Method for the processing of measurement data in a gas friction vacuum meter and a gas friction vacuum meter equipped with a circuit for the practice of this method This invention relates to a method for the processing of measurement data in a gas friction vacuum meter, in which the pressure level is...
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Some exercises March 29th 2010, 11:09 AM Thaurus Some exercises If someone could help me slove a few exercises ,I realy need them? I would need them by Wednesday. And sorry me english is bad. Here they are: http://img337.yfrog.com/img337/2927/mata2b.png Thanks! March 29th 2010, 11:44 AM De...
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Trig equation March 6th 2010, 09:04 AM #1 Newbie Joined Jan 2010 Posts 21 Trig equation I'm kind of stuck on the final steps of this problem. Determine all solution of the equation 5 sin 3x - 11= 3 sin 3x - 12 in the domain 0≤x≤2π I've gotten to the point of sin 3x = -0.5, but I'm not sure of w...
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Help with a Probability question please? June 30th 2008, 11:33 AM #1 Newbie Joined May 2008 Posts 12 A hospital receives 2/3 of its flu vaccine shipments from Company A and the remainder from Company B. Each shipment contains a very large number of vaccine vials. For Company A’s shipments, 10% of the ...
5
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Sangaku problem February 22nd 2013, 10:57 AM #1 Member Joined Dec 2008 Posts 152 Sangaku problem This is one of the sangaku problems (see pic). Pretty much all the information given can be read from the picture. Can someone point me in the right direction? How do you approach such a problem? Re...
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Brevet US7640131 - Data analysis method for analyzing failure root causes for products CROSS-REFERENCE TO RELATED APPLICATION The instant nonprovisional patent application claims priority from Japanese Patent Application No. 2006-087474 filed Mar. 28, 2006 and incorporated by reference in its entirety herein for all p...
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Escape Velocity Consider a spherical asteroid with a radius of 5 km and a mass of 8.65x10^15 kg. (a) What is the acceleration of gravity on the surface of this asteroid? ANSWER: ___ m/s2 (b) Suppose the asteroid spins about an axis through its center, like the Earth, with an angular speed . What is the greatest value c...
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Integral help August 23rd 2009, 10:34 AM #1 Newbie Joined Aug 2009 Posts 4 Integral help Trying to integrate the following ([ will stand for the integral sign) [|cos(x)|^3 dx between 0 and 2pi Now, Maple tells me the answer should be 8/3, but I keep getting 0. [|cos(x)|^3 dx = [cos^2...
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Stabilizer Codes A quantum error-correcting code is a carefully chosen subspace C of the Hilbert space of the computer such that single-qubit errors (and perhaps errors on multiple qubits) acting on any state in C will produce distinguishable states. For instance, suppose E is some operator, such as a single bit flip....
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Show that f(x)=g(x) has a unique solution January 18th 2010, 12:29 PM alpha Show that f(x)=g(x) has a unique solution i need help with this question please. The functions f(x) and g(x) are defined below as: f(x)=sinh(x)= [e^x- e^(-x)]/2 and g(x)= 1/(1+x^2 ) for all real x Show that f(x)=g(x) has a...
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Interval and Point Estimators for the Location Parameter of the Three-Parameter Lognormal Distribution International Journal of Quality, Statistics, and Reliability Volume 2012 (2012), Article ID 897106, 6 pages http://dx.doi.org/10.1155/2012/897106 Research Article Interval and Point Estimators for the Location Para...
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Patent US5325321 - High speed parallel multiplication circuit having a reduced number of gate stages BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel multiplication circuit, and more specifically to a high speed multiplication circuit using a second-order Booth's decod...
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Hausdorff Dimension Show that the graph of a Lipschitz function in $\mathbb{R}^{2}$ has Hausdorff dimension 1. Clearly it suffices to check this for a Lipschitz function on a compact interval $[a,b]$. Denote by $M$ the Lipschitz constant fo $f$. Subdivide $[a,b]$ into $m$ intervals of length $(b-a)/m$, we use these to...
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[SOLVED] Prove differentiability from Lipschitz condition April 8th 2009, 09:50 AM #1 Senior Member Joined Feb 2008 Posts 410 [SOLVED] Prove differentiability from Lipschitz condition A function $f<img src=$a,b)\to R" alt="fLipschitz condition at $x\in(a,b)$ iff there is $M>0$ and $\epsilon>0$ such that ...
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Extended Euclid's algorithm - multiplicative inverse November 11th 2010, 09:40 PM extatic Extended Euclid's algorithm - multiplicative inverse Hi All, Having trouble with using Extended Euclid's algorithm to find multiplicative inverses. I dont understand the algorithm and the more i learn about it the ...
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Displacement, velocity and acceleration May 25th 2010, 05:48 AM lorica2000 Displacement, velocity and acceleration The formula for distance, velocity and acceleration are derived in calculus using s = Svdt(S-integral) and v = at +v0 derive the formula for distance(s) using velocity and the initial velocity v...
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Patent US6385607 - Generating regression trees with oblique hyperplanes CROSS REFERENCES The present application is related to the following application even dated herewith: Docket number Y0999-085, entitled, “Generating Decision-Tree Classifiers With Oblique Hyperplanes,” by inventor Vijay Iyengar, which is incorpora...
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find half life, simple problem April 21st 2010, 12:50 PM #1 Newbie Joined Apr 2010 From Ottawa, Canada Posts 10 find half life, simple problem A 10 g sample of tritium decays to 8.5 grams in 2.93 years. What is the half life of tritium the formula is y= A (0.5)^t/h so A is the original amou...
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Bit rusty on my log rearranging June 12th 2009, 06:18 AM #1 Bit rusty on my log rearranging Can you help me with these Rewrite these relations in index form (that is, without using logarithims): (a) logα (x + y) = logα x + logα y (b) log ₁₀ x = 3 + log ₁₀ y (c) log₃ x = 4log₃y (d) 2log₂x + 3...
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A short antenna tuner Introduction This article describes a method to match short antennas to standard transmission lines. It's mainly intended for radio amateurs working on 137 kHz and 500 kHz bands, because when dealing with long waves, matching the antenna is always a problem. Traditional matchboxes designed for s...
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Green's function for a BVP May 10th 2011, 07:06 PM #1 Green's function for a BVP Dear MHF members, I need help in finding the Green's function for the BVP $y^{\prime\prime}+\frac{1}{x}y^{\prime}=-f(x)$ with $\lim_{x\to0^{+}}|y(x)|<\infty$ and $y(1)=0$. Many thanks. bkarpuz Note. Typo is cor...
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Inner product November 22nd 2010, 05:44 PM #1 Member Joined Sep 2009 Posts 181 Inner product Hello, Can you please help me figure this out? Let <u,v> be the inner product on R2 generated by [ 2 1 ] [ 1 1 ] <u+v,w> u = (2,1) v = (-1,1) w = (0,-1) .... I keep ...
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Integration by parts question October 19th 2011, 07:31 AM #1 Newbie Joined Oct 2011 Posts 9 Let Jn= the integral between 0 and 1 of (x^2n)(sin(Pi*x)) .dx where n=1,2,3.... Use integration by parts to show that: Jn+1 = 1/Pi^2 [Pi - (2n+1)(2n+2) *Jn] So I started by setting u=sin(Pi*x) and dv=...
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Probabilty of smoking November 4th 2011, 11:38 AM #1 Junior Member Joined Oct 2010 Posts 43 Probabilty of smoking A fraction p of citizens in a city smoke. We are to determine the value of p by making a survey that involves n citizens whom we select randomly. If k of these n people smoke, then p'=k/n wil...
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Sigma Notation July 31st 2009, 06:30 PM #1 Junior Member Joined Jul 2009 Posts 67 Sigma Notation I'm sorry if you have a diffuclty reading this. I am not sure how i would go about displaying this in HTML well above the Sigma there is an (n) and below (i=1) on the right side of the sigma this is...
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Higher Ring Derivation and Intuitionistic Fuzzy Stability Abstract and Applied Analysis Volume 2012 (2012), Article ID 503671, 16 pages http://dx.doi.org/10.1155/2012/503671 Research Article Higher Ring Derivation and Intuitionistic Fuzzy Stability Department of Mathematics, Mokwon University, Daejeon 302-729, Repub...
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Reciprocal of Complex Number? October 10th 2009, 06:23 AM Viral Reciprocal of Complex Number? $z=\frac{3+4i}{2-3i}$. What is the complex number which satisfies the equation $zw=1$. My attempt: $\begin{array}{rcrcrc}<br /> z=\frac{3+4i}{2-3i}\\<br /> \\<br /> zw=1\\<br /> \\<br /> w=\frac{1}{z}\\<br /> ...
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Physics Forums - View Single Post - Torque-free precession In classical mechanics, an asymmetric rotating object will generally precess. Expressed in the body-fixed normal system of the object, we have [itex]I_i \dot{\omega_i}=(\vec{L}\times \vec{\omega})_i [/itex] where [itex]L_i=I_i\omega_i[/itex]. Choosing a simpl...
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A question on Jordan content March 3rd 2010, 12:25 AM #1 Member Joined Jul 2009 Posts 120 A question on Jordan content If A is Jordan-measurable with Jordan content c(A), $B\subseteq A$ and is of content zero. Prove that A-B is also Jordan-measurable with the Jordan-content equal to c(A). Thanks! I ...
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Derivatives Quotient Rule May 17th 2010, 12:47 PM #1 Junior Member Joined May 2010 Posts 25 Derivatives Quotient Rule In the problem f(x) = -1/x^2+1 finding the derivative using the quotient rule. the solution would be -x^2+2x-1/(x^2+1)^2? It seems right but im not sure. I don't get that a...
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Patent US4744026 - Methods and apparatus for efficient resource allocation TECHNICAL FIELD This invention relates to systems for using the Karmarkar algorithm for resource allocation among a plurality of resource utilizers and, more particularly, to the use of free (unconstrained) variables in the linear programming m...
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Differentiating an Integral June 24th 2007, 02:16 AM #1 Differentiating an Integral Hi, everyone, I'm new here and don't know how to type mathematics, but I have a scanner. I have a function L_A and it is an integral. I want to differentiate this function with respect to A. I already have the answer writte...
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Electric Field of a Charged Disk Think of the ring as the region between two circles- one of radius a, the other of radius a+ da. The area of the inner circle is [itex]\pi a^2[/itex] and the area of the outer circle is [itex]\pi (a+ da)^2[/itex]. The area between them is [itex]\pi (a+da)^2- \pi a^2[/itex][itex]= \pi (...
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pre calculus problem May 15th 2007, 10:05 PM #1 Junior Member Joined Feb 2007 Posts 59 pre calculus problem Anna decides to approximate the arc length of a sector of a circle of radius 12 units and central angle 3pi/4. She inscribes N identical isosceles triangles in the sector and attempts to sum N ...
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Integration October 4th 2007, 02:21 PM #1 Junior Member Joined Aug 2007 Posts 45 Integration Hello everyone, Im having difficulties with this integral. Integral x csc x cot x dx It cant be subsitution because dy/dx of csc x is -cscx and cotx. It got to be integration by parts but i hav...
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System of nonlinear first-order differential equations (Matrix Riccati system) March 21st 2012, 01:38 AM Degnemose System of nonlinear first-order differential equations (Matrix Riccati system) Hi Do any of you have an idea how to solve the following system analytically, A'(t) = a + b * A(t)^T - A(t) *...
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Linear Programming: Graphical Methods for Minimization Problems and Special Situation September 28th 2008, 05:49 AM #1 Newbie Joined Sep 2008 Posts 1 Linear Programming: Graphical Methods for Minimization Problems and Special Situation I'm completely lost on this question 1. The Charm City Clothiers ...
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Is this a true statement? Can you prove? April 25th 2012, 04:16 PM #1 Newbie Joined Apr 2012 From Greenville, SC Posts 4 Is this a true statement? Can you prove? Let n be a natural number. If 3 does not divide (n2 +2), then n is not a prime number or n = 3. Re: Is this a true statement? Can you prov...
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Semimajor Axis and Eccentricity after increased velocity Question: A space shuttle is in an orbit about the Earth. At its apogee, it uses thrusters and increases its velocity by 400 m/sec. What is the new orbit semimajor axis, eccentricity and how much will the next perigee altitude be increased? Known: Original sem...
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[ 0.00457763671875, 0.042236328125, 0.0478515625, -0.0634765625, -0.08203125, -0.0115966796875, -0.01544189453125, 0.059814453125, -0.04833984375, 0.04345703125, 0.055419921875, -0.060791015625, 0.0216064453125, -0.0252685546875, 0.014892578125, 0.038818359375, 0.002105712890625, 0.0...
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Charge-to-mass ratio of electron/proton 1. The problem statement, all variables and given/known data The Helmholtz coil current = 2.45 A, the magnetic field = 1.91 x 10^(-3) T, the accelerating voltage = 295 V, and the beam radius = .03m. a) Calculate the e/m ratio of an electron. Show that e/m = 2V / r²B² b) During ...
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[ -0.0137939453125, 0.1220703125, -0.043212890625, 0.064453125, 0.08544921875, -0.002960205078125, -0.03564453125, 0.06787109375, -0.03466796875, -0.059326171875, 0.10400390625, -0.10302734375, 0.029296875, 0.01263427734375, 0.00160980224609375, -0.05419921875, -0.0037689208984375, 0...
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