Thomas E.
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 Aug 13 reviewed Approve A fashion victim puzzle Aug 13 reviewed Approve What techniques would be use to prove $6x^2 +12x +8$ cannot be perfect cube for integer x > 0 Aug 7 comment How to find eigenvalues of matrix $\begin{bmatrix} 3& a+1\\a+1&3 \end{bmatrix}$ Have you calculated the determinant of that matrix? Aug 6 reviewed Approve From Hopf Algebras to quantum groups Aug 6 reviewed Reject Question of Differentiation/Integration Aug 4 reviewed Approve How can I write Klein bottle as an adjunction space? Jul 20 awarded Popular Question Jul 8 reviewed Approve Surface area of $y = \sin(\pi x)$, from $x=0$ to $2$, rotated about the $x$-axis. Jul 7 comment How to simplify this integrand, At first you might want to note that $e^{-2t}+4e^{-2t}=5e^{-2t}$. Jul 3 answered Limit of Uniformly convegent sequence of real valued functions: Jun 28 reviewed Approve Why doesn't L'Hopital's rule work in this case? Jun 28 reviewed Approve Derived subgroup of $S_n$ and $D_n$ Jun 25 reviewed Approve Explain proof of sum equivalence Jun 25 reviewed Approve How to derive the formula for the sum of the first $n$ perfect squares? Jun 21 revised $C_c(X)$ is dense in $C_0(X)$ added 3 characters in body Jun 17 reviewed Reject Discriminant of Polynomials (Galois Theory) Jun 9 reviewed Reject What three odd integers have a sum of 30? Jun 9 reviewed Approve For what value of $\alpha$ is the limit $\lim{x\to 0} \frac{\arctan(x) \cdot \log(\sin(x)) - x \cdot \log(x) }{x^\alpha}$ finite and non-zero? Jun 9 reviewed Edit What to do when the second derivative test fails? Jun 9 revised What to do when the second derivative test fails? some beautiful changes, modestly