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 Jan17 asked Hopf Bifurcation of Reaction-Diffusion System Oct30 asked Maximising Entropy of Random Variable taking Positive Integer Values Feb8 accepted Finite Subgroups of Multiplicative Group of Field Feb8 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 Feb8 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. Feb8 asked Finite Subgroups of Multiplicative Group of Field Nov17 awarded Student Nov17 awarded Editor Nov17 awarded Scholar Nov17 comment Identity Theorem I just changed it. Sorry, and thanks for knowing what I really meant Nov17 accepted Identity Theorem Nov17 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 Nov17 revised Identity Theorem edited body Nov17 comment Identity Theorem $f(1) = 0$ as $f(1) = f(1/1)$ and each $f(1/k) = 0$ Nov17 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. Nov17 answered Cauchy-Schwarz Inequality for Complex Numbers Nov17 asked Identity Theorem