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If n is a positive integer, is (1/10)^n < .01? Author Message TAGS: If n is a positive integer, is (1/10)^n < .01? [#permalink] 22 Jun 2008, 23:17 ...
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Domain and Range of the parametric equation March 25th 2009, 03:33 PM oceanmd Domain and Range of the parametric equation Please check whether the following problem s solved correctly. Thank you. Graph the following parametric equation. Identify the domain and range. Eliminate the parameter. x=2+q y=...
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College Savings Plan March 26th 2012, 04:57 PM hardestproblemever College Savings Plan Hey Guys, I am trying to figure out this problem dealing with a college savings plan for my kids. Its currently September.....my kids are 14,13, and twins at 11. They are all planning on going to college in September ...
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Bessel's equation April 10th 2011, 12:38 PM #1 Senior Member Joined Aug 2009 Posts 349 Bessel's equation ok im supposed to find the general solution of the differential equation on im a little, well a lot stuck on this problem.... $4x^{2}y''+4xy'+(4x^{2}-25)y$ i do remember getting it into...
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Calculating Tunneling Probability E1982 Another attempt at the equation |[tex]T^2[/tex]| = [tex] e^{-2 \alpha x} dx [/tex] where alpha = [tex] \sqrt{2m/h^2 * (V-E)}[/tex] So final equation to use would be |[tex]T^2[/tex]| = [tex] e^{-2 \int \sqrt{2m/h^2 * (V-E) }dx} [/tex] This is the one I think! So now only qu...
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linear recurrence sequences February 13th 2010, 12:26 PM #1 Newbie Joined Feb 2010 Posts 4 linear recurrence sequences i am having trouble with this sequence: x1=3 xn+1=0.8 xn-5 (n=1,2,3....) how do i find a closed form, also in the tenth term correct to 4SF Can someone explain how can i d...
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Non-degenerate tensors? I had an additional question here, hope someone can suggest: This is a HW I had many years back, that I was never able to answer: I am trying to show that a bilinear map B(x,y) in a fin.dim inner-prod. space (V,<,>)is non-degenerate iff the representing matrix is skew-symmetric ( for the matrix...
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A-level Chemistry/OCR (Salters)/Buffer solutions Calculating the pH of a buffer solutionEdit $\mbox{pH} = -\log_{10}{ \left ( K_a \frac{\left [ \mbox{acid} \right ]}{\left [ \mbox{salt} \right ]} \right ) }$ DerivationEdit For any equilibrium $a\mbox{A} + b\mbox{B} \rightleftharpoons c\mbox{C} + d\mbox{D} \,\!$ th...
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Congruence Problem June 18th 2011, 06:15 PM VinceW Congruence Problem This is from chapter on linear congruences: Show that if p is an odd prime and a is a positive integer not divisible by p, then the congruence $x^2 \equiv a \pmod {p}$ has either no solution or exactly two incongruent solutions. I ca...
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Troublesome Integral 2 Sorry, the first version was incorrect. This is the correct integral. $<br /> \int (xe^{2x})/(2x + 1)^2 dx<br />$ Wolfram tells me that you need to use the Series expansion... integral&#x5b;&#x28;x&#x2a;Exp&#x5b;2&#x2a;x&#x5d; &#x29;&#x2f;&#x28;&#x28;2&#x2a;x &#x2b; 1&#x29;&#x5e;2&#x29;&#x5d; - ...
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2 Related Rates Problems!! October 17th 2012, 04:08 PM #1 Junior Member Joined Oct 2012 From US Posts 37 This 2 questions on my review are killing me and I don't know what to do. Please any help on how to solve these two? Instructions would be helpful. 1. Water is drained out of a tank in the sha...
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Derivative chain rule help October 18th 2009, 03:54 PM #1 Junior Member Joined Oct 2009 Posts 30 Derivative chain rule help Basically the Problem gives a table, but the way it words the problem kinda confuses me a bit: Suppose that the function f and g and their derivatives with respect to x have the...
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Patent US20030215022 - OFDM detection apparatus and method for networking devices BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to wireless networking, and more particularly to a detection scheme of Orthogonal Frequency Division Multiplexing (OFDM) signals for an IEEE 802.1...
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Congruent Diagonalization May 13th 2010, 06:14 PM demode Congruent Diagonalization http://img24.imageshack.us/img24/7783/44818829.gif So, in the answer I don't understand how they obtained $L= \begin{pmatrix}1 & 0 & 0 \\ 3 & 1 & 0 \\ 1 & -1 & 1 \end{pmatrix}$ I don't think this "L" here is the low...
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Mean Value Theorem November 6th 2006, 07:38 PM #1 Junior Member Joined Oct 2006 Posts 36 Mean Value Theorem can someone please explain step by step what to do? thanx!! Use analytic methods to find a) the local extrema, b) the intervals on which the function in increasing, and c) the intervals on whi...
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Problem Finding the Speed of Particle (Vector) October 27th 2012, 02:23 PM #1 Junior Member Joined Aug 2012 From Texas Posts 49 Problem Finding the Speed of Particle (Vector) Hey everyone, I am having a bit of difficulty solving this problem. It says: A particle has position function $\ r(t) ...
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Patent US5587710 - Syntax based arithmetic coder and decoder CROSS REFERENCE TO RELATED APPLICATION This application is related to and incorporates by reference in its entirety U.S. patent application Ser. No. 08/359,241, filed Dec. 16, 1994, entitled "Syntax Based Arithmetic Coding for Low Bit Rate Videophone." CROS...
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Diff Eq - Existence/uniqueness theorem February 8th 2009, 12:27 PM #1 Member Joined Aug 2007 Posts 96 Diff Eq - Existence/uniqueness theorem So the question is: Using the existence and uniqueness theorem, show that the differential equation dy/dt = sqrt(y-1), with initial condition that y(0)=2, has a...
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Patente US5627896 - Method of controlling a disturbance FIELD OF THE INVENTION This invention relates to the area of active control of noise and vibration. Specifically, the invention relates to improvements in implementations of least mean square (LMS) and Filtered-x LMS algorithms for controlling active systems. BA...
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A (apparently?) non-local quantum field theory I need to derive the euler-lagrange equations for the following non-local lagrangian density for a complex scalar field ψ [itex]\mathcal{L} = \partial_{\mu}\psi^* \partial_{\mu}\psi - \lambda \int dy\, f(x,y) \psi^*(y) \psi(y)[/itex] where λ is the coupling constant, f i...
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Basis for orthognal vector April 6th 2011, 07:10 PM #1 Junior Member Joined Sep 2008 Posts 29 Basis for orthognal vector In R3 let S=span((1,2,4)^T) What is a basis for S^(perpendicular)? I know that 0=x*y=1y1+2y2+4y3 and that y2 and y3 are free variables so y1=-2y2-4y3 i have then tr...
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integrating factor Solve x(dy/dx)=y+x^3 Solve x(dy/dx)=y+x^3 when y=3 and x =1 have i done this correct ? It all looks good until you say $\displaystyle \int P ~dx = -\frac{1}{x} = \ln x$ which makes little sense. You are trying to find an integrating factor $\displaystyle I = e^{\int -\frac{1}{x}~dx}$ go from there....
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f(x)=b*a^x April 22nd 2008, 02:22 AM #1 Junior Member Joined Mar 2008 Posts 58 f(x)=b*a^x Here is a question I want you to look into. I want to see where I have gone wrong. In 1948 there was 823 cancerpatients. I 1993 there was 5707 cancerpatients. Find the values a and b. Facit: a = 1.045 b = 770 ...
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Brevet US5671022 - Image processing system and method for converting YCbCr data composed of luminance and chroma into RGB data of three primary colors BACKGROUND OF THE INVENTION The present invention relates to an image processing system and method for converting YCbCr data composed of luminance and chroma into RGB d...
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How to find nonsingular matrix? April 20th 2009, 07:04 AM jennifer1004 How to find nonsingular matrix? Find, if possible, a nonsingular matrix P such that $P^{-1}AP$ is diagonal. $<br /> \begin{pmatrix}1 & 1 & 2\\0 & 1 & 0\\0 & 1 & 3\end{pmatrix}<br />$ April 20th 2009, 07:24 AM TheEmptySet Quote: ...
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Wallis product. 1. August 16th 2010, 06:46 PM #1 Wallis product. Last edited by mr fantastic; August 16th 2010 at 09:12 PM. Reason: Re-titled. 2. August 16th 2010, 07:53 PM #2 The first part is straightforward, just plug in x = 1. For the second part, what is meant by compare? Are you asked...
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Summation identity Why is the following identity true? $\sum_{r=1}^{n}r^2 = \frac{1}{6} n(n+1)(2n+1)$ sorry, had problems posting the equation. It is there now The best way to answer this 'why?' is to prove it yourself. Do you know of mathematical induction? $\sum_{r=0}^{n}r^2=?$ Solution via 'Differences Series' (O...
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Patent US6009437 - Linear fitting with missing data: applications to structure-from-motion and to characterizing intensity images CROSS-REFERENCE TO RELATED APPLICATIONS This is a conversion of provisional application Ser. No. 60/041,695, filed Mar. 25, 1997, and provisional application Ser. No. 60/043,540, filed Apr....
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[solved] ss November 23rd 2009, 02:05 PM #1 Member Joined Feb 2009 Posts 138 [solved] ss Hi: Let K be a field and, for a, b in K \ {0}, write a ~ b if ab is a sum of two squares in K. The author writes: why is ~ an equivalence relation? I see that for any a, b in K \ {0}, ab= ab + 0, where 0 is a...
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Why does valence electrons not produce electric field in the space? HomogenousCow Well can you calculate the electric field of an electron in a hydrogen atom, or at least write a differential equation for it? Maxwell's Equations with ##\small \rho = q_e\psi^{*}\psi##. Here, ##\small q_e## is the electron charge. So...
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Viete's relations problem rock.freak667 Let [itex]P(x)=x^3 -10x+11=0[/itex] what is u+v+w,uv+uw+vw and uvw ? and what you want to get is [itex]tan^{-1}(u)+tan^{-1}(v)+tan^{-1}(w)[/itex] if we let [itex]A=tan^{-1}(u);B=tan^{-1}(v);C=tan^{-1}(w)[/itex] thus making tanA=u;tanB=v and tanC=w, are able with some trig ...
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Two problems with solutions...help!! January 25th 2008, 08:05 AM #1 Junior Member Joined Jan 2008 Posts 63 Two problems with solutions...help!! Sergio plans to paint the 4 walls of his room with 1 coat of paint. The walls are rectangular, and, according to his measurements, each wall is 10ft by 15ft. He ...
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Guess a simple for for P_n for this sequence February 27th 2013, 05:22 PM hcuk Guess a simple for for P_n for this sequence I just need to find the pattern to a), which i am having the hardest time doing. P[2] = 2/3 P[3] = 5/8 P[4] = 3/5 P[5] = 7/12 P[6] = 4/7 P[7] = 9/16 Thanks in ...
4
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Please help derive angle theta_s in terms of angle theta September 10th 2009, 10:40 AM #1 Member Joined Sep 2009 Posts 242 Thanks 1 Derive angle under spiral radius in terms of unit circle angle Please see the attached thumbnails. I have here this lovely archimedean spiral inscribed within a unit cir...
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Math proof I can make some math proofs which are (obviously) wrong. Your mission is to find out why the proofs ain't correct. When someone have submitted a good explanation, I will give you a new one.. Let's start simple. x = y Divide by (x-y) x/(x-y) = y/(x-y) Subtract y/(x-y) x/(x-y) - y/(x-y) = 0 Write on same den...
5
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Principle of Differentiation and Integration query July 22nd 2010, 01:02 PM #1 Principle of Differentiation and Integration query Hi Folks, if we have an implicit function $z=x^2-4y^2+5xy-6=0$ eqn1 then we can find the standard derivative $\frac{dz}{dx}=2x-8y\frac{dy}{dx}+5x\frac{dy}{dx}+5y$ eqn 2 and ...
5
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Patente US8137175 - Pari-mutuel wagering system RELATED APPLICATION DATA The present application is entitled to the benefit of and claims priority from the commonly owned, co-pending applications for patent having at least one inventor in common herewith entitled “Pari-mutual Wagering System,” Ser. No. 60/656,214, fil...
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Generating function for a sequence April 27th 2011, 01:03 AM mehn Generating function for a sequence The question is as follows: It is known that the generating function for the sequence , {1,8,27,64,...} is [x(x^2 + 4x +1)]/(1-x)^4 Use the result to show summation from r=1 to n of r^3 = [n^2(n^2+1)]...
5
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[SOLVED] Normal Subgroups: Prove g^2 is in H for all g in G. June 3rd 2009, 10:10 AM #1 [SOLVED] Normal Subgroups: Prove g^2 is in H for all g in G. Can someone help me with this proof? Let H be a subgroup of G with index 2. Prove that g² ∈ H for all g ∈ G. Thanks! A subgroup of index 2 is norm...
5
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how to slove the congruence s.t x^2+1=0 mod 5 ?? how to slove the congruence such that $<br /> x^{2}+1\equiv 0 (\bmod 5)<br />$ cheers! Since you're working in mod 5 you just need to check the values 0,1,2,3,4. For 0 we have, $0^2 + 1 = 1$ For 1 we have, $1^2 + 1 = 2$ For 2 we have, $2^2 + 1 = 5 = 0$ mod 5 For 3 we h...
4
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chi square degrees of freedom February 17th 2010, 07:40 AM #1 Newbie Joined Feb 2010 Posts 1 chi square degrees of freedom If X and Y are independent random variables, X having a chi-square distribution with 3 degrees of freedom, and X+Y having a chi-square dist with 7 degrees of freedom, prove that Y ha...
4
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Functions! f(x)= January 5th 2009, 01:21 AM #1 Junior Member Joined Oct 2008 Posts 50 Functions! f(x)= ok so i have my core 1 exam on friday and am struggling with SOME functions. i am at work and dont have the question for reference but its alogn the lines of (x-2) is a factor of f(0) fi...
4
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My Constraint Programming Blog Nontransitive dice, Ormat game, 17x17 challenge Here are some new models done the last weeks and some older not mentioned before. (I have also spent some time with Numberjack , a Python based solver, and will blog about this later on.) Nontransitive dice MiniZinc: nontransitive_dice...
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Finding minimum variance unbiased estimator (MVUE) March 30th 2010, 03:49 PM redwings6 Finding minimum variance unbiased estimator (MVUE) Random sample Y1,....,Yn with pdf: f(y|θ) = 3y^2/θ^3, 0<y<θ and 0 elsewhere Given Y(n) = max(Y1,...,Yn) is sufficient for θ, a) Show that Y(n) has pdf: f(n)(y...
4
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Measuring by Shadows Date: 05/22/2001 at 07:55:02 From: Andreza Rio Branco Subject: Measuring by shadow How can I measure a tree using its and my shadows? Date: 05/23/2001 at 08:21:25 From: Doctor Rick Subject: Re: Measuring by shadow Hi, Andreza, thanks for writing to Ask Dr. Math! The secret is in the sun's ra...
4
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Geometric picture of invariant differential of an elliptic curve up vote 5 down vote favorite 4 What is the geometric meaning of $\omega=dx/(2y+a_1x+a_3)$ for an elliptic curve? This question is an adjunct to MO Q1 on formal laws and L-series, which motivated Q2. Q1 (Silverman) and Darmon (pg. 6) state: The invarian...
4
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Linear Transformations in Normed Spaces June 3rd 2009, 07:05 PM Jose27 Linear Transformations in Normed Spaces I know this is easy, but I can't find the way to prove this: Let $l:(V,\Vert . \Vert _V) \longrightarrow (W,\Vert . \Vert _W)$ be a linear transformation. Show that if $l$ is continous at $0$ then ...
5
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Locus question Hi, I have this problem: If 'R' is the fixed point (3,2) and 'P' is the movable point (x,y) Find the equation of the locus of 'P' if distance PR is twice the distance from P to y=-1 Thanks! Hello, withyou! Did you make a sketch? Exactly where is your difficulty? $R$ is the fixed point (3,2), and $P$ is ...
4
[ -0.00750732421875, -0.046630859375, -0.0703125, -0.0302734375, 0.007080078125, 0.0167236328125, 0.034423828125, 0.044921875, 0.04052734375, -0.01239013671875, 0.109375, 0.0308837890625, 0.000560760498046875, 0.0234375, 0.02490234375, 0.05859375, -0.022216796875, -0.07275390625, 0...
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-Open Sets and Soft Abstract and Applied Analysis Volume 2014 (2014), Article ID 891341, 7 pages http://dx.doi.org/10.1155/2014/891341 Research Article Soft -Open Sets and Soft -Continuous Functions Department of Mathematics, Cumhuriyet University, 58140 SİVAS, Turkey Received 11 November 2013; Accepted 25 Decembe...
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Math Help May 17th 2012, 06:44 PM #1 $a_1b^2_2c_1=a_2b^2_1c_2$This is given.and then If the roots of $a_1x^2+b_1x+c_1=0$ are $\alpha_1,\beta_1$and the roots of $a_2x^2+b_2x+c_2=0$are $\alpha_2,\beta_2$Then prove $\frac {\alpha_1} {\ beta_1}=\frac {\alpha_2}{\beta_2}\ \mbox{or}\ \frac {\alpha_1} {\beta_1}=\fra...
4
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Find all solutions for and exact value of... May 6th 2009, 03:58 PM alexcross Find all solutions for and exact value of... 1) Find all solutions θ 0° ≤ θ < 360° to the equation cos(2θ) = cosθ 2) Find the exact value of cot(795°) I have no idea how to do these, any help or tips? May 6th 2...
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help with probability question please! February 10th 2013, 05:41 PM #1 Junior Member Joined Jan 2009 Posts 57 help with probability question please! Suppose you have 10 cards, 5 labeled "placebo" and 5 labeled "test." You place them at random into 10 envelopes, 5 labeled "placebo" and 5 labeled "test...
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[ -0.00469970703125, -0.032470703125, -0.0294189453125, -0.043212890625, -0.0009918212890625, 0.038330078125, 0.1123046875, 0.0115966796875, -0.0048828125, -0.06640625, 0.0289306640625, -0.0240478515625, -0.0179443359375, 0.06494140625, -0.02197265625, 0.020751953125, 0.0380859375, -...
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Newton's law of cooling. March 11th 2010, 04:29 PM #1 Newbie Joined Mar 2010 Posts 1 Newton's law of cooling. Hi Everyone, can someone please help me with this? It has to do with Newton's Law of cooling. A fast food resturant wants a container that can quickly cool coffee from 200 degrees to 130 deg...
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[ -0.0235595703125, 0.01202392578125, -0.0091552734375, 0.01519775390625, 0.034912109375, 0.01385498046875, -0.0093994140625, 0.0155029296875, -0.05908203125, 0.1025390625, 0.02978515625, -0.05126953125, 0.10205078125, 0.0250244140625, 0.07275390625, -0.0966796875, 0.0223388671875, -...
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My Agriculture Information Bank - Quantity of Irrigation Water - How Much to Irrigation Current Category » Water Management Including Micro Irrigation ...
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Simple Calc Question - don't know how to start April 13th 2010, 08:34 PM #1 Simple Calc Question - don't know how to start Find $y$ as a function of $x$ if $\frac{dy}{dx} = y(2x+1)$ and $y = -3$ when $x = 0$. Any idea on where to get started? I have no clue... This is a first order linear diff...
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Brevet US6279569 - Determination of leak and respiratory airflow This Application is a Continuation Application of U.S. patent application Ser. No. 08/911,513 for DETERMINATION OF LEAK AND RESPIRATORY AIRFLOW, filed Aug. 14, 1997, now U.S. Pat. No. 6,152,129. FIELD OF THE INVENTION The invention relates to methods an...
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Patent US8130956 - Efficient and low power encrypting and decrypting of data CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of co-pending European Patent Application No. EP07113715, filed 2 Aug. 2007, which is hereby incorporated herein. FIELD OF THE INVENTION The present invention relat...
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Transitive relation February 18th 2009, 08:54 PM #1 Member Joined Nov 2007 Posts 108 Transitive relation 1)Prove or disprove: If A is a set for which each $R \in A$ is a transitive relation, then $\bigcup A$ is a transitive relation. I think this is true. So I tried to prove it. Let $(x,y) \in \bigc...
4
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[SOLVED] Solve the following differential equation? Solve the following differential equation: $3x^2y^2 + \cos (xy) - xy \sin (xy) + \frac{dy}{dx}\{2x^3y - x^2\sin (xy)\} = 0$ $\frac{dy}{dx}\{2x^3y - x^2\sin (xy)\} = xy \sin (xy) -3x^2y^2 - \cos (xy) +xy \sin (xy)$ $\frac{dy}{dx} = \frac{xy \sin (xy) -3x^2y^2 - \cos (...
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Simultaneous Equations Solve the simultaneous equations using the substitution method. (a) 2x+3y= 22 3x+2y= 28 (b) 3x-2y= 28 4x+5y= -1 Thanks :) 2x+3y= 22------ 1 3x+2y= 28------ 2 We will do elimination by equating coefficient: In this we multiply either 1 or both the equations by suitable numbers to ensure that the ...
4
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Roots of quadratic equation June 22nd 2010, 07:31 PM #1 Newbie Joined Jun 2010 Posts 21 Roots of quadratic equation The roots of the quadratic equation $16x^2 + 7x + 4 = 0$ are $\alpha^2$ and $\beta^2$. Find two distinct quadratic equations whose roots are $\alpha$ and $\beta$. My steps: Sum of...
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geometry/algebra. Areas with only perimeter given April 29th 2008, 09:55 AM #1 Newbie Joined Apr 2008 Posts 2 geometry/algebra. Areas with only perimeter given I am having trouble figuring out where to begin. The problem: A figure has the shape of a square with semicircles on each side. The figu...
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quick simplifying question July 9th 2009, 12:51 AM #1 Junior Member Joined Jul 2009 Posts 36 quick simplifying question i have a quick question with simplifying a variable expression can someone tell me what one is correct? heres the problem 8-12x+20 is simplified to what A)28-12x or B)-12x+28? Both...
4
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Problem 15 January 15th 2007, 05:35 PM ThePerfectHacker Problem 15 Behold! A plain simple isoseles triangle appears besides you. Frozen in a white boring background this triangle is full of supprises. You must locate the angle by the red lines. The angle is not 30, it is 20, sorry.. January 17th 2007, 10:43...
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Please help with PDE in polar coordinates. October 31st 2013, 03:25 PM #16 Junior Member Joined Jul 2013 From Arizona Posts 44 Thanks 2 Re: Please help with PDE in polar coordinates. Or should I write this as differentiate respect to x only in my example. $r^2=x^2+y^2\;\Rightarrow\;\frac{dr}...
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Noncompact Equilibrium Points and Applications Journal of Applied Mathematics Volume 2012 (2012), Article ID 373462, 9 pages http://dx.doi.org/10.1155/2012/373462 Research Article Noncompact Equilibrium Points and Applications ^1Research Chair on Applied and Actuarial Mathematics, Department of Mathematics, College ...
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Singular Value Decomposition 14.4 Singular Value Decomposition A general rectangular M-by-N matrix A has a singular value decomposition (SVD) into the product of an M-by-N orthogonal matrix U, an N-by-N diagonal matrix of singular values S and the transpose of an N-by-N orthogonal square matrix V, The singular value...
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arccos(cos4), arctan(tan4) Is it 4 degrees or 4 radians. If radians: $\text{arccos} (\cos4) eq 4$ because the range of arcos is $0 \leq \text{arcos} x \leq \pi$ ...... 4 radians is in the third quadrant - outside the range of arcos. So you need the 'equivalent' angle that's in the second quadrant - the second quadant i...
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Prove sup(ab)=sup(a)sup(b) August 5th 2012, 03:40 PM gordo151091 Prove sup(ab)=sup(a)sup(b) Hey, this is the problem $A,B \subset \mathbb{R}$ A,B Bounded. Let $AB :=\left \{ ab:a \in A, b \in B \right \}$. Proof $sup(A)sup(B)=sup(AB)$ I proofed that $xy \leq sup(A)sup(B) \forall x \in A, y \in B$ (...
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Mark Needham Archive for the ‘graphs’ tag Since I now spend most of my time surrounded by graphs I thought it’d be interesting to learn a bit more about graph processing, a topic my colleague Jim wrote about a couple of years ago. I like to think of the types of queries you’d do with a graph processing engine as bein...
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Conversion (Trigonometry Variable To Standard Variable) January 10th 2009, 10:37 AM #1 Conversion (Trigonometry Variable To Standard Variable) I came across an example when understanding Fourier Series. There was one part where they converted a trigonometry function to standard variable. They did this: $\fra...
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Patent US7346592 - Method and an apparatus for predicting intake manifold pressure of an internal-combustion engine REFERENCE TO RELATED APPLICATIONS This application is a divisional of U.S. application Ser. No. 10/695,486, filed Oct. 29, 2003. The contents of the prior application is hereby incorporated by reference....
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Division problem with GCD February 3rd 2007, 07:47 PM tttcomrader Division problem with GCD Let r, s, and t be integers, and suppose gcd(r,s)=1, r|t, and s|t. Prove rs|t. My work so far: I have attempted to use the definition of gcd and division to solve the problem. There exist integers a,b,...
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Half-life of radioactive substance 1. The problem statement, all variables and given/known data If 20% of a radioactive substance disappears in 70 days, what is its half-life? 2. Relevant equations y = C*e^(k*t) where t is time in days k is the constant of proportionality? y is the current amount of substance 3. T...
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The MLFMA Equipped with a Hybrid Tree Structure for the Multiscale EM Scattering International Journal of Antennas and Propagation Volume 2014 (2014), Article ID 281303, 6 pages http://dx.doi.org/10.1155/2014/281303 Research Article The MLFMA Equipped with a Hybrid Tree Structure for the Multiscale EM Scattering Sta...
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Free groups and subgroups January 12th 2013, 05:18 AM #1 Free groups and subgroups Let $F_2$ be the free group on two generators $F_2=<x,y>$. Prove that the free group on 3 generators $F_3$ is a subgroup of $F_2$. Not completely sure how to go about doing this. So $F_3=<x,y,z>$. Can I show that z can be writ...
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Solve Logarithm October 28th 2008, 09:27 AM #1 Newbie Joined Oct 2008 Posts 3 Solve Logarithm I'm having the same kind of problems on all of the following problems: I cannot seem to isolate X. Help if you can! 1. 5^(x+1)=e^x 2. 3^(x+1)=(9^x)(27^(x+1)) 3. 10^(2x+1)=4^(x+1) 4. 5^(3x-2)=3^(...
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error C2664: 'F_Ite' : cannot convert parameter 1 from 'double *' to 'double' Hi all C++ experts,I am new in C++ & got an error C2664: 'F_Ite' : cannot convert parameter 1 from 'double *' to 'double' . please anyone help me out fron this problem & please tell me something about this whitch help me in future. Thanks ...
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Finding the limit June 27th 2013, 09:45 PM math604 Finding the limit Hi, I need to find the limit of this trigonometric function. Attachment 28684 I used the trig identity for the cosine, the one for cos(a+b), and i get -sinh. Attachment 28685 Now I'm stuck. I think I should use the squeeze t...
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Modeling of the Response Time of Thermal Flow Sensors Open Access This article is • freely available • re-usable Article Modeling of the Response Time of Thermal Flow Sensors ^2 IGS (International Graduate School for Dynamics in Logistics), University of Bremen, c/o BIBA Hochschulring 20, D-28359 Bremen, Germa...
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[SOLVED] show zero x vector in v3, (cross product) February 23rd 2009, 09:01 PM #1 Senior Member Joined Jan 2007 Posts 477 [SOLVED] show zero x vector in v3, (cross product) must show that 0 x a and a x 0 = 0 for any vector a in V3 so would this be sufficient: <0, 0, 0> x <1, 2, 3> = 0 and...
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Frustrating word problems April 1st 2008, 02:43 AM #1 Newbie Joined Apr 2008 Posts 16 Frustrating word problems Hello, I am new to these forums. After hitting a wall on my take-home quiz, I am on the hunt for some assistance. Our professor told us we can use any means necessary to get help, so I am doing...
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Absolute Value of Complex Numbers September 7th 2009, 04:55 PM #1 Absolute Value of Complex Numbers I've been staring at this problem for quite some time... Let z belong in C such that |z| = 1. Compute |1+z|^2 + |1-z|^2 If it was like |z + w|^2 where w was also a complex number, then that would be a lot...
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Show that u(x,t) satisfies this partial differential equation February 21st 2011, 05:40 AM maximus101 Show that u(x,t) satisfies this partial differential equation For $x$$\in$$R$ and $t > 0$ , define $u(x, t) :=$$\int_0^{x/\sqrt{t}} \! e^{-s^2} \, \mathrm{d}s$ Show that u satisfies the partial differen...
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Functions Prove that if f' and g' are continuous on a line interval [a,b] then http://www.cramster.com/Answer-Board...6080265979.gif Hello, Mathstud : I think he wants to demonstrate it :p $\int_a^b f(x)g'(x)dx=? f(x)g(x)|_a^b -\int_a^b g'(x)f(x) dx$ Consider f(x)g(x) $f(x)g(x)|_a^b = \int_a^b \left(f(x)g(x) \right)' ...
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Rearranging an equation October 16th 2008, 11:16 AM mezhopking Rearranging an equation I have the following equation: t(t - x) = 3y(3y - x) And I need to rearrange it to find x in the terms of y and t, in simplest form. (Assuming that 3y - t is not equal to 0). Please could anyone be so kind as to ...
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Question on potential calculation February 15th 2010, 11:07 AM #1 Member Joined Feb 2009 Posts 130 Question on potential calculation Hi everyone need help for this question, im not sure what formula to use.really appreciate if someone can help me. A proton with an energy of 1.5 eV impinging on a...
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Patent US20060193294 - Mimo signal processing method involving a rank-adaptive matching of the transmission rate CROSS REFERENCE TO RELATED APPLICATIONS This application is based on and hereby claims priority to PCT Application No. PCT/DE2003/003713 filed on Nov. 10, 2003 and German Application No. 102 54 384.4 filed ...
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Patent US20070101243 - Method for puncturing a low density parity check code PRIORITY This application claims priority under 35 U.S.C. §119 to an application filed in the Korean Intellectual Property Office on Sep. 30, 2005 and assigned Serial No. 2005-92573, the contents of which are incorporated herein by reference....
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Pricing Variance Swaps for Stochastic Volatilities with Delay and Jumps International Journal of Stochastic Analysis Volume 2011 (2011), Article ID 435145, 27 pages http://dx.doi.org/10.1155/2011/435145 Research Article Pricing Variance Swaps for Stochastic Volatilities with Delay and Jumps ^1Mathematical and Comput...
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GMAT Errors: Avoid Face-Palm Moments GMAT Errors: Avoid Face-Palm Moments How many times have you reviewed a question that you missed in practice and had that “face-palm” moment in which you realize that you missed something because you stopped too soon or solved for the opposite or just a portion of what the questi...
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Proving : existance of the inverse/ bijective May 10th 2009, 06:24 PM #1 Proving : existance of the inverse/ bijective I don't know how to prove the following : Let $f:A \to B$ be a function. Prove that $f$ has an inverse if and only if $f$ is bijective. I'm lacking of any idea about proving $\Rightarrow$ and...
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Algorithm Improvement of the Low-End GNSS/INS Systems for Land Vehicles Navigation Mathematical Problems in Engineering Volume 2013 (2013), Article ID 435286, 12 pages http://dx.doi.org/10.1155/2013/435286 Research Article Algorithm Improvement of the Low-End GNSS/INS Systems for Land Vehicles Navigation GNSS Resear...
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Patent US6661363 - System and method for adaptive sigma-delta modulation TECHNICAL FIELD AND BACKGROUND ART The invention generally relates to signal processing, and more particularly, to analog to digital conversion using sigma-delta modulation. Sigma-delta (Σ-Δ) modulation is a widely used and thoroughly investigate...
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Patent US6711514 - Method, apparatus and product for evaluating test data BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to methods, apparatus and products for quality control. In another aspect, the present invention relates to methods, apparatus and products for analyzing a qual...
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Summations 11.9 Summations The a + (calc-summation) [sum] command computes the sum of a formula over a certain range of index values. The formula is taken from the top of the stack; the command prompts for the name of the summation index variable, the lower limit of the sum (any formula), and the upper limit of the su...
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Solving a radical equation May 6th 2011, 11:51 PM DjNito Solving a radical equation I am not too sure on how to actually solve this radical equation been stuck on it for a while the equation is: \sqrt{2x+6} - \sqrt{x+4} =1 any help would be awesome thanks in advance May 7th 2011, 12:02 AM Chris L...
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Derivative discretization with fixed boundary condition Also there is another small confusion.. say I have an eq like this >> ------------------------------------------------- [itex]\dot{u} = \partial_x{f(\partial_x{u})} [/itex] and if my BC now is >> [itex]\partial_x{u} = 0[/itex] at both ends for all time. ----...
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Patent US5491705 - De bruijn graph based VLSI viterbi decoder STATEMENT OF GOVERNMENT INTEREST The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment of any royalty thereon. The present invention provides a Viterbi decoder based on the De Bru...
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Patent US5105464 - Means for improving the speech quality in multi-pulse excited linear predictive coding DESCRIPTION CROSS-REFERENCE TO RELATED APPLICATION This application is related in subject matter to Richard L. Zinser application Ser. No. 07/353,855, filed May 18, 1989 concurrently herewith for "Hybrid Switched ...
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