Dennis Gulko
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 Mar30 revised $(\delta,\varepsilon)$ Proof of Limit added 16 characters in body; edited title Mar20 comment Evaluate $\int \frac{1}{x^3+3x+1}dx$ Which is what exactly? When you learn\teach Calculus 1, do you talk about $\log(x-2i+3)$? Mar20 comment Evaluate $\int \frac{1}{x^3+3x+1}dx$ Indeed it is - but you need to know complex integration for that Mar20 comment Evaluate $\int \frac{1}{x^3+3x+1}dx$ Only one of them is real... Mar20 answered Evaluate $\int \frac{1}{x^3+3x+1}dx$ Mar20 comment Evaluate $\int \frac{1}{x^3+3x+1}dx$ @Power: Are you sure that it is $x^3$ in the denumerator? Feb24 answered If a normal subgroup of a symmetric group contains a transposition. Prove that the normal subgroup is the entire symmetric group. Feb22 answered Why $(f(-x)) ^\prime=-f ^ \prime(-x)$? Feb12 awarded Yearling Feb8 awarded Enlightened Feb8 awarded Nice Answer Jan20 comment When do two matrices have the same column space? Use column operations to get to the reduced form - in the columns Jan6 answered $t^2y'' - 3ty' + 4y = 0$, how do you solve for $y$ in terms of $t$? Jan5 comment Sum of the series $\sum_{i=1}^n a^i i^r$ That's a finite sum, not series... What is $r$? Dec22 awarded Constituent Dec16 awarded Caucus Dec2 answered 2 question about power rules from a test i had today Nov24 revised Placing 5 pieces on a 5x5 grid with no main diagonal added 108 characters in body Nov24 awarded Nice Answer Nov24 answered Placing 5 pieces on a 5x5 grid with no main diagonal