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 20h accepted Heine borel theorem on the complex plane 20h comment Heine borel theorem on the complex plane Thank you very much! 21h asked Heine borel theorem on the complex plane Apr24 accepted Bolzano-Weierstrass theorem (complex case) Apr24 asked Bolzano-Weierstrass theorem (complex case) Apr22 asked gcd of an infinite subset of naturals Apr21 comment What's the difference between finite and finitely generated algebras Thank you very much, it was exactly I was looking for! Apr21 comment What's the difference between finite and finitely generated algebras What do you mean by "ring of polynomials of $a_1,\ldots a_n$? Apr21 asked What's the difference between finite and finitely generated algebras Apr17 accepted What is the name of this book? Apr17 asked What is the name of this book? Apr17 asked Books on vector analytic geometry Apr16 comment Show that the numbers $(2n + 1)$ and $(4n^2+1)$ are relatively prime @abiessu how do you prove this question using expasions? Apr16 comment Proof of that in an integral domain, every prime element is irreducible. @EdwardPoon you have to use the fact $p$ is prime in the proof, but what you want to prove is $p$ is irreducible and to prove this you have to prove if $p=ab$, then $a$ or $b$ is unit. Apr16 comment Proof of that in an integral domain, every prime element is irreducible. @EdwardPoon yes, you are right. However, you want to prove that $p$ is irreducible. You already know that $p$ is prime. Apr16 comment Proof of that in an integral domain, every prime element is irreducible. @EdwardPoon Why do you like to analyse this case? you want to prove that $p$ is irreducible. If you prove the case for $px=ab$, you are proving $px$ is irreducible, instead of $p$. Apr16 revised Proof of that in an integral domain, every prime element is irreducible. added 34 characters in body Apr16 answered Proof of that in an integral domain, every prime element is irreducible. Apr16 revised I'm having troubles to find this parametrization. improving the question Apr15 asked I'm having troubles to find this parametrization.