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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?