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Feb
20
awarded  Nice Answer
Feb
20
answered A question on Collatz's conjecture
Feb
18
reviewed Leave Closed Intuitive Approach to Sheaf and Cech Cohomology
Feb
18
reviewed Leave Closed Intuitive Aproach to Dolbeault Cohomology
Feb
18
reviewed Leave Open Different styles of writing/reading articles
Feb
18
reviewed Close Is it possible to find explicit formula for the product $\prod_{\substack{d\mid n \\ d>1}} (1-\mu(d)/\varphi(d))^{\varphi(d)}$?
Feb
17
reviewed Leave Closed Set nor its compliment contain an uncountable closed set
Feb
17
reviewed Approve What is DAG and what has it to do with the ideas of Voevodsky?
Feb
15
comment Does the Euler product converge at $s=1$ for the Dirichlet $L$ function?
All the standard books (e.g. Davenport) will discuss bounds for $\psi(x,\chi)$ for a non-principal character $\chi$, from which you can obtain the desired convergence (on the $1$-line) by partial summation. Convergence on any other line in the critical strip is unknown, being equivalent to a quasi-Riemann hypothesis.
Feb
12
awarded  Enlightened
Feb
12
awarded  Nice Answer
Feb
11
reviewed Leave Closed partial converse of existence of covering spaces
Feb
10
reviewed Leave Open Generating primes with floor of a polynomial $[p(n)]$
Feb
9
reviewed Close The Work of Pierre Deligne
Feb
8
comment Word complexity of primes mod 4
See this related MO question: mathoverflow.net/questions/168378/… . So far as I know, the only non-trivial result is Shiu's theorem which implies that arbitrarily long strings of $0$'s (or arbitrarily long strings of $1$'s) appear in this word.
Feb
8
reviewed Leave Open Automorphisms of $\mathbb C_p$
Feb
7
reviewed Leave Closed Why did Bourbaki ignore the theory of categories?
Feb
7
reviewed Leave Closed Why did Grothendieck say stop publishing his works?
Feb
7
reviewed Leave Closed Disruptive innovations in mathematical notations
Feb
7
reviewed Leave Closed Algorithms to compute the rank of a parametrized matrix