Shitikanth
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 Dec 13 awarded Yearling Mar 8 awarded Notable Question Dec 16 awarded Caucus Dec 13 awarded Yearling Mar 5 awarded Popular Question Dec 13 awarded Yearling Aug 27 answered Power series $\sum n^3a_nz^n$ Aug 27 comment Counting Question No, I'm pretty sure their solution is incorrect. For this question, there is no need to count at all, see my answer. Aug 27 answered Counting Question Aug 27 comment Counting Question The textbook's answer seems to be wrong. $|A| = {5 \choose 1} 2! {25 \choose 2} 3! {8 \choose 3} {4 \choose 1}$ = 4,032,000. Aug 27 comment Complex number inequality, $|e^{z_1}-e^{z_2}| \leq |z_1 - z_2|$ if $Re(z_1),Re(z_2) \leq 0$ You should probably start with proving $|e^z - 1| \le |z|$ for $Re(z) \le 0$. Aug 26 comment If $f(x)$ is an integrable function, can we always find its anti-derivative using ordinary methods of integration? Do you have any constraints on what substitutions are allowed? If $\int f (x) dx = g(x)$ where g(x) is an elementary function, you can always substitute $y = g(x)$ to get $\int f(x) dx = \int dy = g(x) + const$. Aug 24 answered Calculation of volume and centre of mass of an arbitrary polyhedron Aug 24 comment “Mixing” the diagonals of a positive semidefinite matrix I was mislead by my intuitions to believe that the claim was true. I still don't think that this was a bad question. Why the downvotes? Aug 23 revised Ideal of a ring added 8 characters in body Aug 23 comment Ideal of a ring Well, at least these are the right ideals of $R$. Aug 23 comment Ideal of a ring Ahh, I didn't consider left multiplication. I knew I was missing something. Thanks Aug 23 answered Ideal of a ring Jul 17 comment Parabolas intersecting in integer points Thanks, that's perfect. Jul 17 accepted Parabolas intersecting in integer points