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 Nov 14 comment Proof/intuition that any number can be expressed in binary form and every number will have a unique representation? Every real number? Or every integer? Nov 9 reviewed Reviewed Find the sum of this series Sep 5 comment injective and surjective Keep one thing in your mind when you try to prove this kind of statement: $f \circ g$ is just another function. You start with let $h = f \circ g$, then prove $h$ is bijective using whatever conditions $f$ and $g$ have. Aug 25 comment Finiteness of subgroup $\rightarrow$ Finiteness of the group @M.Vinay Yes, you're right. But, it's not clear to me where did this answer show $|G/H|$ is finite before using Lagranges's theorem? Aug 25 comment Finiteness of subgroup $\rightarrow$ Finiteness of the group I thought Lagranges's theorem starts with "For any finite group $G$". Aug 25 awarded Custodian Aug 17 revised Category Theory vs. Universal Algebra - Any References? Add link and tag Aug 17 awarded Nice Question Mar 2 awarded Yearling Feb 13 comment What mathematics should I study to understand Neural Nets / Machine Learning? The OP does not need to study staticstics? Dec 24 comment Websites that promote co-operation and social networking among mathematicians @GitGud Again, I read the entire question. This question has nothing to do with Math.SE at all. The downvote is for the mismatch between the first paragraph and the second one. Dec 24 comment Websites that promote co-operation and social networking among mathematicians I read the entire question. I downvote it because I think we are no facebook. We are a community. We are a Q&A site. I don't know about others. I come here to learn math, not to socialize. Dec 9 awarded Caucus Sep 24 awarded Autobiographer Jul 9 reviewed No Action Needed Comparison test involiving e Jul 2 awarded Curious Jun 19 reviewed No Action Needed How to perform a monotonic function fitting of data points? Mar 15 awarded Popular Question Jan 21 comment Largest white rectangle on board Cross posted on CS.SE Dec 6 comment Routing Automaton @ArthurFischer I am not sure the routing automata here is different from synchronizable DFA in Exercise 1.59 of Sipser's book. If they are the same, I think this is a homework problem.