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 Dec3 awarded Enlightened Dec3 awarded Nice Answer Nov29 comment functional equation uniqueness $f(x^{2})= f(x)^{2}$ in $\mathbb{C}$ and $f(x)+f''(x) = 0$ in $\mathbb{C}$ @ccc: the problem statement requires that $f$ be holomorphic. Nov14 comment Was it an even deal for me? Completely changing the question after posting it (without leaving any hint that the question has changed) is considered bad form. Sep28 accepted Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? Sep28 revised Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? added 157 characters in body Sep27 revised Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? added 123 characters in body Sep27 comment Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? @Pierre-Yves Gaillard: Thanks for the suggestion. I have added the author's name. The book is part of the Graduate Studies in Mathematics series. Sep27 revised Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? added 16 characters in body Sep27 revised Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? edited body Sep27 comment Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? Well that's strange. I can't see any error in what you wrote; have I misunderstood the exercise? Here is the text exactly as it appears: "2.17. Let $R$ be a ring, and let $E = \text{End}_{\text{Ab}}(R)$ be the ring of endomorphisms of the underlying abelian group $(R, +)$. Prove that the center of $E$ is isomorphic to the center of $R$." Sep27 asked Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? Sep26 accepted Does this “extension property” for polynomial rings satisfy a universal property? Sep26 revised Does this “extension property” for polynomial rings satisfy a universal property? edited title Sep26 revised Does this “extension property” for polynomial rings satisfy a universal property? edited tags Sep26 asked Does this “extension property” for polynomial rings satisfy a universal property? Aug23 comment Prove that all even integers $n \neq 2^k$ are expressible as a sum of consecutive positive integers $10 = 1 + 2 + 3 + 4$, $12 = 3 + 4 + 5$ Aug16 comment Can a circle's circumference be divided into arbitrary number of equal parts using straight edge and compass only? Very nice answer! +1 Aug10 answered Is there a way to pick a $k$ such that $p_0p_1 + ik$ is always a product of two primes? Aug10 comment Is there a way to pick a $k$ such that $p_0p_1 + ik$ is always a product of two primes? My point is that if $k \neq 0$, then $p_0p_1 + ik$ always has at least 3 prime factors for $i = p_0p_1$.