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 Jan 17 asked Hopf Bifurcation of Reaction-Diffusion System Oct 30 asked Maximising Entropy of Random Variable taking Positive Integer Values Feb 8 accepted Finite Subgroups of Multiplicative Group of Field Feb 8 comment Finite Subgroups of Multiplicative Group of Field The number of co-prime integers with n which are less than or equal to n. So we want values of n so the degree is 2 or less, which are precisely 1, 2, 3, 4, 6. Thanks Chris Feb 8 comment Finite Subgroups of Multiplicative Group of Field There are cyclic subgroups of $\mathbb C$* for any integer n. This can be seen by taking the generator to be the $n^{th}$ root of unity. Feb 8 asked Finite Subgroups of Multiplicative Group of Field Nov 17 awarded Student Nov 17 awarded Editor Nov 17 awarded Scholar Nov 17 comment Identity Theorem I just changed it. Sorry, and thanks for knowing what I really meant Nov 17 accepted Identity Theorem Nov 17 comment Identity Theorem really sorry for the edit. accidentally had $\alpha^n$ in the summation instead of $\alpha_n$ I'm glad you realised that Richard. Sorry xaviermo2 Nov 17 revised Identity Theorem edited body Nov 17 comment Identity Theorem $f(1) = 0$ as $f(1) = f(1/1)$ and each $f(1/k) = 0$ Nov 17 comment Identity Theorem Thank you very much. I was trying to consider a power series but (stupidly) couldn't see which sequence $z_n$ to take so I could apply the identity theorem. Nov 17 answered Conjugate in Cauchy-Schwarz Inequality for Complex Numbers Nov 17 asked Identity Theorem