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 Sep 27 asked Why are the centers of $R$ and $\text{End}_{\text{Ab}}(R)$ isomorphic? Sep 26 accepted Does this “extension property” for polynomial rings satisfy a universal property? Sep 26 revised Does this “extension property” for polynomial rings satisfy a universal property? edited title Sep 26 revised Does this “extension property” for polynomial rings satisfy a universal property? edited tags Sep 26 asked Does this “extension property” for polynomial rings satisfy a universal property? Aug 23 comment Prove that all even integers $n \neq 2^k$ are expressible as a sum of consecutive positive integers $10 = 1 + 2 + 3 + 4$, $12 = 3 + 4 + 5$ Aug 16 comment Can a circle's circumference be divided into arbitrary number of equal parts using straight edge and compass only? Very nice answer! +1 Aug 10 answered Is there a way to pick a $k$ such that $p_0p_1 + ik$ is always a product of two primes? Aug 10 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 $i = p_0p_1$. Aug 10 comment Is there a way to pick a $k$ such that $p_0p_1 + ik$ is always a product of two primes? $p_0p_1+(p_0p_1)k = p_0p_1 (1 + k)$, no? Jun 16 awarded Enthusiast Jun 11 accepted Combinatorial proof that binomial coefficients are given by alternating sums of squares? Jun 11 comment Combinatorial proof that binomial coefficients are given by alternating sums of squares? Very nice! (characters...) Jun 11 asked Combinatorial proof that binomial coefficients are given by alternating sums of squares? Feb 11 comment If a product of relatively prime integers is an $n$th power, then each is an $n$th power Have you considered the prime factorizations of $a$, $b$, and $c$? Feb 9 revised Can someone explain how this question is reduced using basic postulates add info on p6b Feb 9 answered Can someone explain how this question is reduced using basic postulates Feb 8 comment No prime number between number and square of number Bertrand's postulate guarantees the existence of a prime between $n$ and $2n$ for all integers $n > 1$. Therefore there are no non-trivial examples of the phenomenon you describe. Jan 17 awarded Nice Answer Jan 16 awarded Commentator