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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