Stefan
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 Apr2 comment Find the order of $Z(G)$. Are $p$ and $q$ distinct? Mar20 answered If $\alpha$ and $\beta$ are ordinals then $\alpha \in \beta \Leftrightarrow \alpha \subsetneq \beta$ Mar20 reviewed No Action Needed Integrating reciprocals of functions with known antiderivatives Mar19 comment Graph Theory Proofs (Don't understand the Concept). Take a look at a maximum path in the graph (a path that can not be extended any further). Mar19 reviewed Reviewed Convergence of the recursive sequence $q_n = 1 - (1-pq_{n-1})^k$ Mar19 reviewed Reject Prove that if Rank$(A)=n$, then Rank$(AB)=$Rank$(B)$ Mar18 reviewed Reject M an R-module, where M is a commutative ring, if $M≅R/I$ for some ideal I of R, then $M$ is a cyclic R-module Mar18 revised Finding $\sum\frac{1}{2^n(n+1)}$ fixed latex Mar18 reviewed No Action Needed How to determine the dimension of a row space. Mar18 reviewed No Action Needed Comparison test, with one negative term? Mar18 awarded Custodian Mar18 reviewed Approve Showing $\sum _{n=2}^\infty \frac{(-1)^n}{\sqrt n +(-1)^n}$ is not convergent Mar17 reviewed Looks OK How to tell where parentheses go in functional notation? Mar17 reviewed No Action Needed generate large range function from smaller Mar17 reviewed No Action Needed Why did it take mathematicians so long to discover non-Euclidean geometry? Mar17 reviewed No Action Needed Maximal abelian subgroup of general linear groups Mar17 reviewed Reviewed Formulation of Linear Programming problem? Mar17 comment Modulus of $c^z$ No, your answer is correct. It just so happens that $|c^z|$ does not depend on $y$. Mar17 answered If $n-1$ is prime show it is relatively prime. Mar17 comment Suppose that $f$ is a differentiable function such that $f(g(x)) = x$ and $f^\prime(x) = 1+ [f(x)]^2$. Show that $g^\prime(x) = \frac{1}{1+x^2}$. Exactly. It's a neat trick.