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 1d reviewed Approve For these subsets $S$, are they subspace for the indicated vector space $V$ 1d reviewed Approve Help with finding limit of function with 2 variables 1d reviewed Approve How do I find orthonormal basis of $U$? 2d comment Finding the inverse of a map given in vector form. @AASJC: no, the case $\alpha=0$ is excluded, I wrote that in the answer. 2d comment Finding the inverse of a map given in vector form. @AASJC: exactly, $\Phi^{-1}=\Phi.$ 2d revised Finding the inverse of a map given in vector form. added 48 characters in body 2d answered Finding the inverse of a map given in vector form. 2d revised $f:[-1,1]\to \mathbb{R}$ such that $f(x)=x$ if $x=1/n$ and $n$ is a nonzero integer, and $1-2x$ otherwise. Question: is $f$ differentiable at $1/3$? added 35 characters in body; edited title 2d reviewed Reject Cubic modular equation 2d reviewed Approve $\sum_{k=1}^n 1/k - \log n$ Apr 27 reviewed Edit Integral and Cauchy theorem Apr 27 revised Integral and Cauchy theorem correction Apr 27 answered How to find an unknown matrix which when multiplied with a vector gives the cross product of 2 vectors Apr 26 revised Differential equation; Find the complete solution edited title Apr 26 revised Dirac-Delta function representation - infinite sum involving trigonometric identities added 4 characters in body Apr 25 revised multiplication associative property trig addition identities added 15 characters in body Apr 25 revised Measure of a interval in $\mathbb{R}$ and $\mathbb{R}^2$ added 44 characters in body; edited title Apr 25 revised How to find Integrating factor of this equation added 4 characters in body Apr 25 revised How to solve this differential equation added 9 characters in body Apr 25 comment How to solve this differential equation Where is the equal sign?