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Jul
23
reviewed Approve Is this inequality true? If yes, for what functions?
Jul
21
revised $\Re(e^{-j\theta}A)-\Re(e^{-j\theta}B)\gt0 \Leftrightarrow cos(\theta-\angle(A-B))\gt0$
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Jul
3
revised Proof to show that sums of vectors spanning a vector space also span a vector space
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Jul
1
revised Prove that $f'(c ) = \lambda f(c )$
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Jul
1
revised Prove that for all $x$, $y$ in $\mathbb{R}$ there exist $z$, $g$ such that $x = z + g$, $y = z - g$
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Jul
1
revised prove that this number contains two equal digits
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Jul
1
revised Differentiate the Function: $ f(x)= x\ln x\ - x $
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Jun
24
revised How to calculate the limit: $\lim _{ x\to1 } \frac { nx^{ n+1 }-(n+1)x^{ n }+1 }{ (e^{ x }-e)\sin(\pi x) } $
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Jun
21
revised How to find the curl, divergence, gradient and laplacian of functions without calculating the individual indices
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Jun
21
revised If real numbers $x$ and $y$ satisfy the equation $\frac {2x+i}{y+i}= \frac {1+i\sin{\alpha}}{1-i\sin{3\alpha}}$ then quotient $\frac xy$ is equal to?
edited title
Jun
21
comment what are the general form of eigenvalues of an orthogonal matrix
But for real eigenvalues, the theorem of the question is true.
Jun
21
comment what are the general form of eigenvalues of an orthogonal matrix
$\bar\lambda$ is eigenvalue of the conjugate transpose of $A$.
Jun
21
revised Trouble differentiating $\int_1^{x^3}\arcsin(t)dt$
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Jun
21
comment About the roots of the derivative of a polynomial.
@PVanchinathan: $a$ and $b$ cannot be anything, should be chosen so that the semi-plane contains all roots of the polynomial.
Jun
14
revised How to calculate $\int_{-\infty}^{\infty} x^2 \cos(ax)e^{-x^2}dx$ using Cauchy's theorem
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Jun
14
revised For compact $A$, $\inf\{\varrho(y,x) : y \in A\}=\varrho(a,x)$
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Jun
14
revised For compact $A$, $\inf\{\varrho(y,x) : y \in A\}=\varrho(a,x)$
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Jun
14
reviewed Close Prove proposition on real numbers
Jun
14
revised If the function $f(x)=(x^3)/(e^{x/2})$ and $g(x)$ is the inverse function, how to find derivative of $g(x)$ at $x=1$?
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Jun
14
revised Heat equation with Neumann boundary conditions solution maximum/minimum
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