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 Sep 24 comment Why consider neighbourhood containing an open set? Are you asking about the source of the terminology or about proving that a neighbourhood of some point x is open ? Sep 20 comment Doing extended synthetic division with more than 2 terms google.co.il/… Sep 20 answered Number of conjugates of an $m$-cycle $\sigma$ in $S_n$ Sep 20 comment Number of conjugates of an $m$-cycle $\sigma$ in $S_n$ But what is $m$ ? Sep 4 comment A trick for calculating $n^6$ that I don't understand And if anyone knows how to fix this spacing of the \mod.. Sep 4 answered A trick for calculating $n^6$ that I don't understand Sep 4 asked What is a good theoretical, yet somewhat practical, book about error correction codes? Aug 30 comment Can 720! be written as the difference of two positive integer powers of 3? Thanks for the explanation. This was a really nice solution! Aug 30 comment Can 720! be written as the difference of two positive integer powers of 3? Can you please explain the first congruence? I don't see where the $2^k$ came from Aug 29 answered Finding the minimal polynomial of a linear operator Aug 28 comment Is it possible to embed $\mathbb Z^n$ inside $\mathbb Z^m$ as a $\mathbb Z$-module for $m < n$? What exactly do you mean by linearly independent where we arn't talking about vector spaces ? Aug 19 answered Prove that $\lim _{x \to \infty} \sin x$ doesn't exist (using delta epsilon) Aug 18 answered G's order is a multiply of coprime numbers, need to prove about its subgroups. Aug 15 answered True or false. If A ∪ B = ∅ , then A = ∅ and B = ∅ . Aug 12 comment Mental Calculations And given that the answer was probably an integer given the nature of the question, this really solved it the way I see it Aug 10 comment Geometric or at least application view of a group with 3 elements? How about rotation by 120 degrees? Aug 7 answered Showing irreducibility of a polynomial. Aug 7 comment $\sum_{n=1}^\infty a_n = \sum_{n=1}^\infty n a_n$ possible? This assumes that the series is a positive series? Jul 26 comment How is the Fourier transform a geneeralization the the Fourier series? @Mitsos - seems that I forgot the $n$, should be ok now Jul 26 revised How is the Fourier transform a geneeralization the the Fourier series? edited body