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2d
answered Group Action as permutations
2d
comment Group Action as permutations
Could you add any reference to the cited paper?
Aug
31
answered Prove that $R$ is an integral domain $\Leftrightarrow$ $R[x]$ is an integral domain
Aug
23
awarded  Informed
Aug
23
comment Prime ideals in $R[x]$, $R$ a PID
@user26857 indeed my proof is based on an adaptation of the proof for $\mathbb Z$ :)
Aug
23
comment Prime ideals in $R[x]$, $R$ a PID
I've made some changes to the answer, with some additional data that I hope may help you to solve the problem you were addressing.
Aug
23
revised Prime ideals in $R[x]$, $R$ a PID
Deleted wrong answer, made some comments to help the OP solving the wished problem.
Aug
23
comment Prime ideals in $R[x]$, $R$ a PID
Unfortunately I've been for a long time far away from an internet connection. I see the problems with the answer, thanks for pointing out.
Jul
31
revised Failure of group definition with weaker axioms
Added stuff
Jul
31
answered Failure of group definition with weaker axioms
Jul
28
comment Finding the kernel of maps between (polynomial) rings
@user26857 I agree that is a lot like shooting a little bird with a cannon, nonetheless it is a way to take familiarity with the instrument of dimension theory..... at least in my personal opinion.
Jul
27
answered Finding the kernel of maps between (polynomial) rings
Jul
12
comment When the unit of a universal property is an isomorphism
@Berci yes you're right :) thanks for pointing out.
Jul
12
revised When the unit of a universal property is an isomorphism
Made a correction
Jul
11
answered When the unit of a universal property is an isomorphism
Jul
8
comment Can all theorems be deduced directly from the ZFC axioms?
Just a pun: a system that allows to derive everything is inconsistent ... I hope ZFC is not.
Jul
3
revised A functor preserves a product of $A$ and $B$ iff $F(A \times B) \cong F(A) \times F(B)$?
added 37 characters in body
Jul
3
revised A functor preserves a product of $A$ and $B$ iff $F(A \times B) \cong F(A) \times F(B)$?
added 270 characters in body
Jul
3
answered A functor preserves a product of $A$ and $B$ iff $F(A \times B) \cong F(A) \times F(B)$?
Jun
29
answered Prime ideals in $R[x]$, $R$ a PID