Shitikanth
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 Mar8 awarded Notable Question Dec16 awarded Caucus Dec13 awarded Yearling Mar5 awarded Popular Question Dec13 awarded Yearling Aug27 answered Power series $\sum n^3a_nz^n$ Aug27 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. Aug27 answered Counting Question Aug27 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. Aug27 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 $Re(z) \le 0$. Aug26 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 $\int f(x) dx = \int dy = g(x) + const$. Aug24 answered Calculation of volume and centre of mass of an arbitrary polyhedron Aug24 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? Aug23 revised Ideal of a ring added 8 characters in body Aug23 comment Ideal of a ring Well, at least these are the right ideals of $R$. Aug23 comment Ideal of a ring Ahh, I didn't consider left multiplication. I knew I was missing something. Thanks Aug23 answered Ideal of a ring Jul17 comment Parabolas intersecting in integer points Thanks, that's perfect. Jul17 accepted Parabolas intersecting in integer points Jul17 comment Parabolas intersecting in integer points That helps, thanks!