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 Mar 31 awarded Nice Question Feb 4 awarded Notable Question Nov 29 awarded Popular Question Oct 14 accepted How do I partially differentiate the multivariable equation $z^2=x^2+y^2$? Oct 14 accepted A poll carried a survey to examine the approval rate of a policy in a country. Which is most appropriate? Oct 14 accepted Show that there is a non-zero constant $a$ such that $T_1(v)=aT_2(v)$ for all $v\in R^n$ Oct 14 accepted Is there a faster way to do this? Find an orthogonal matrix $P$ and a diagonal matrix $D$ such that $A=PDP^T$ Oct 14 accepted Question about Notation. What does this means? $f[0]=1, f[0,1]=-1$ Oct 14 accepted How do I generate a sparse invertible 10000 by 10000 binary matrix with 30 to 50 non-zeros per row? Oct 14 asked How do I partially differentiate the multivariable equation $z^2=x^2+y^2$? Sep 28 awarded Popular Question Sep 22 awarded Popular Question Sep 14 awarded Popular Question Aug 21 comment Intuition behind $(-\frac{1}{2})! = \sqrt{\pi}$ I do not have the answer, but I was wondering how does one define the factorial of a negative non-integer value? Aug 21 comment Permutations of a Multi-Set This solution is very astonishing, and I loved it. +1! Aug 8 accepted Check my solution: For the recurrence $a_{n+3}=a_{n+2}+a_{n+1}+a_n$ where $a_1=a_2=a_3=1$, prove that $a_n\leq 2^{n-2}$. Aug 8 asked Check my solution: For the recurrence $a_{n+3}=a_{n+2}+a_{n+1}+a_n$ where $a_1=a_2=a_3=1$, prove that $a_n\leq 2^{n-2}$. Aug 6 accepted Derivation of the density function of student t-distribution from this big integral. Aug 4 awarded Good Question Jul 2 comment How do I generate a sparse invertible 10000 by 10000 binary matrix with 30 to 50 non-zeros per row? ah! haha! thanks!