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 Feb4 comment Let $A,B$ be two subgroups of $G$. Show that $g(A\cap B)=gA \cap gB$ for all $g \in G$ This would be easier to think about if you took $c \in A \cap B$. So this would rephrase your first step to $gc \in g(A \cap B)$. The result basically follows from here. Jul17 comment How to solve this Pell's equation $x^{2} - 991y^{2} = 1$ Read this. Jul3 comment Riemann Zeta formula Jul2 comment Your favourite application of the Baire Category Theorem Jul1 comment APB is congruent to DPC. Find $x$ @Michael I believe that is the case. Jul1 comment Find numbers with a given number of divisors. End with "$0$" means that the number must have at least have one divisor of $2$ and one divisor of $5$. The rest follows from the divisor function. Jun27 comment Where is the most appropriate place to ask about the contribution of published papers? Mathscinet has reviews of certain papers. Jun26 comment Find Absolute Max and Min All you quantum typists.... Jun26 comment Exposition on hyperelliptic curves I checked this out from the library today and it is a very clearly written book indeed. Jun25 comment Mathematical Discoveries that were made or supported by savants I've actually thought about this for awhile. My searches so far have come up empty. Jun25 comment You must be joking … math and fun This is related to this and this MO thread which is pretty much an exhaustive list. Jun25 comment Using sage to test for squares in residue fields What about the residue_symbol method? Jun25 comment Using sage to test for squares in residue fields Did you take a look at this? Jun24 comment Important papers in arithmetic geometry and number theory @Marvis You're right. I'm not able to. Thank you for pointing it out. Jun24 comment Important papers in arithmetic geometry and number theory @Marvis I think it's good as answer. Should I delete it then? Jun24 comment Integral of $\int{\frac{dx}{(\arcsin{x})\sqrt{1-x^2}}}$ You set $dv = 1/arcsin(x)$? How did you even integrate that? Jun23 comment Important papers in arithmetic geometry and number theory @draks That is a very good paper. It's listed in the wikipedia article I linked to. Jun23 comment Learning Model Theory Really? I saw it when I search on amazon but most of the reviews said it was rather terse and that you needed much background. That was not your experience then? Jun21 comment Topology for beginners We've had so many reference requests for topology books that there is a thread about topology threads. Jun20 comment Famous papers in algebraic geometry Oh you meant all of it. You're probably right there. They are incredibly long.