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38 Questions

Views Newest Activity Votes

votes

answers

views

Complex Integration poles real axis

Feb 23 '16 at 19:38 Community♦ 1

votes

answers

307

views

Deduce $\lvert ab\rvert = \lvert ba\rvert$ for all $a,b\in G$ where $G$ is a group.

abstract-algebra group-theory

Dec 31 '14 at 2:28 Community♦ 1

votes

answer

231

views

Vector calculus and Frenet-Serret equations

differential-geometry

Jul 30 '14 at 8:08 Jyrki Lahtonen 114k

votes

answers

11k

views

Defining the equation of an ellipse in the complex plane

geometry complex-numbers

Aug 19 '16 at 17:58 Beepboop bebop 86

votes

answer

213

views

Fourier transform of $f(x) = \chi\cos^n(\pi x)$

fourier-analysis transformation

Jan 15 '15 at 10:56 Community♦ 1

votes

answers

937

views

Kepler's First Law in 3D

3d polar-coordinates

Jul 21 '13 at 4:37 40 votes 7,992

votes

answers

105

views

Show $\lvert\lambda_1a_1 + \lambda_2a_2 + \cdots + \lambda_na_n\rvert < 1$ when $\lvert a_i\rvert < 1$ and $\lambda_i\geq 0$

inequality complex-numbers

Jan 30 '15 at 16:15 Mister Benjamin Dover 687

votes

answers

views

Lagrange's identity in the complex form

complex-numbers summation

Dec 12 '15 at 1:14 leo 6,260

votes

answer

372

views

Is there an errata for Ahlfors Complex Analysis?

general-topology compactness

Mar 18 '15 at 17:21 copper.hat 133k

votes

answer

152

views

Laplace transform via complex analysis

complex-analysis laplace-transform contour-integration

Jan 4 '15 at 17:24 dustin 6,894

votes

answer

390

views

probability: continuous uniform distribution mean by symmetry

integration probability-theory expectation uniform-distribution

Jan 2 '15 at 19:21 Matthew Towers 7,682

votes

answer

191

views

Quadratic formula for $z^2 + (\alpha + \beta i)z + \gamma + i\delta = 0$ where $z\in\mathbb{C}$

complex-numbers

Dec 19 '14 at 0:36 Robert Israel 349k

votes

answer

views

Using complex analysis to find the Inverse Laplace transform

complex-analysis laplace-transform residue-calculus

Nov 24 '14 at 17:10 user_of_math 3,341

vote

answer

332

views

Understanding block diagrams

laplace-transform control-theory

Dec 17 '14 at 16:59 obareey 3,189

vote

answer

views

Tensors: traction free planes

linear-algebra tensors

Nov 29 '14 at 2:08 user_of_math 3,341

vote

answers

views

complex analysis: book suggestion after using Serge Lang's book

complex-analysis soft-question

Nov 19 '14 at 1:44 Community♦ 1

vote

answer

views

probability: nonlinear best predictor $\hat{Y} = g(X)$

probability uniform-distribution

Nov 11 '14 at 4:03 Graham Kemp 93.8k

vote

answer

832

views

continuous probability: average power of a Gaussian random variable $\mathcal{N}(0, \sigma^2)$

probability probability-theory

Nov 9 '14 at 18:43 saz 89.6k

vote

answer

877

views

continuous probability: signal to noise ratio $\mu^2/\sigma^2$

probability probability-distributions uniform-distribution

Nov 9 '14 at 2:36 dustin 6,894

vote

answers

156

views

Poisson Integral is equal to 1

complex-analysis complex-integration

Nov 4 '14 at 12:54 robjohn♦ 280k

vote

answer

388

views

Finding conditional probability from the joint PMF

probability conditional-probability

Oct 20 '14 at 2:07 Graham Kemp 93.8k

vote

answer

218

views

Integral Equation-Volterra 2nd kind

ordinary-differential-equations integral-equations

Oct 30 '13 at 21:55 Community♦ 1

votes

answer

views

linear algebra: projecting a line past a known point by a known distance

linear-algebra algebra-precalculus projection

May 31 at 4:17 auscrypt 7,665

votes

answer

634

views

Ahlfors method for partial fraction decomposition

complex-analysis polynomials partial-fractions

Feb 9 '15 at 20:29 Daniel Fischer♦ 176k

votes

answer

views

Probability: determine if $Z[n] = X[n] + Y[n]$ is WSS when $X[n]$ and $Y[n]$ are WSS

probability random-variables stationary-processes

Dec 4 '14 at 17:54 the_candyman 9,601

votes

answer

113

views

Probability: IID random process notation question.

probability random-variables

Dec 4 '14 at 3:37 Graham Kemp 93.8k

votes

answer

198

views

Tensors: Maxwell stress on an isotropic elastic material

linear-algebra tensors

Dec 2 '14 at 3:47 user_of_math 3,341

votes

answer

views

probability: Bernoulli random vector where $X_i$'s all have the same mean and variance

probability-theory probability-distributions

Nov 10 '14 at 17:17 user178543 115

votes

answer

views

probability: best linear predictor $\hat{Y} = aX + b$

probability uniform-distribution

Nov 10 '14 at 13:31 sds 3,767

votes

answer

114

views

probability: transformation of a random variable $Y = X^4 + 1$

probability transformation

Nov 3 '14 at 20:40 Jimmy R. 33.5k

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38 Questions

Complex Integration poles real axis

Deduce $\lvert ab\rvert = \lvert ba\rvert$ for all $a,b\in G$ where $G$ is a group.

Vector calculus and Frenet-Serret equations

Defining the equation of an ellipse in the complex plane

Fourier transform of $f(x) = \chi\cos^n(\pi x)$

Kepler's First Law in 3D

Show $\lvert\lambda_1a_1 + \lambda_2a_2 + \cdots + \lambda_na_n\rvert < 1$ when $\lvert a_i\rvert < 1$ and $\lambda_i\geq 0$

Lagrange's identity in the complex form

Is there an errata for Ahlfors Complex Analysis?

Laplace transform via complex analysis

probability: continuous uniform distribution mean by symmetry

Quadratic formula for $z^2 + (\alpha + \beta i)z + \gamma + i\delta = 0$ where $z\in\mathbb{C}$

Using complex analysis to find the Inverse Laplace transform

Understanding block diagrams

Tensors: traction free planes

complex analysis: book suggestion after using Serge Lang's book

probability: nonlinear best predictor $\hat{Y} = g(X)$

continuous probability: average power of a Gaussian random variable $\mathcal{N}(0, \sigma^2)$

continuous probability: signal to noise ratio $\mu^2/\sigma^2$

Poisson Integral is equal to 1

Finding conditional probability from the joint PMF

Integral Equation-Volterra 2nd kind

linear algebra: projecting a line past a known point by a known distance

Ahlfors method for partial fraction decomposition

Probability: determine if $Z[n] = X[n] + Y[n]$ is WSS when $X[n]$ and $Y[n]$ are WSS

Probability: IID random process notation question.

Tensors: Maxwell stress on an isotropic elastic material

probability: Bernoulli random vector where $X_i$'s all have the same mean and variance

probability: best linear predictor $\hat{Y} = aX + b$

probability: transformation of a random variable $Y = X^4 + 1$