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Nov
19
comment Is there a general way to prove series and products are modular?
@user45195 The mild moral qualm about reposting this question is stronger than my attachment to reputation.
Nov
16
awarded  Popular Question
Nov
15
revised Is there a general way to prove series and products are modular?
edited title
Nov
15
asked Is there a general way to prove series and products are modular?
Nov
9
answered How many subgroups or order 8 an abelian Group of order 72 can have
Oct
26
comment Extension field of finite degree
Do you mean finite?
Oct
25
comment condition for homeomorphism
Are $A,B$ open sets?
Oct
24
comment Path connected iff the action of $\pi_1(Y,y)$ on $p^{-1}(y)$ is transitive.
If I have been unclear, please ask for clarification or rephrasing of my answer.
Oct
24
answered Path connected iff the action of $\pi_1(Y,y)$ on $p^{-1}(y)$ is transitive.
Oct
24
comment Prove that the number of automorphisms in $\mathbb Q[\alpha]$ equals $1$ $(|Aut\mathbb Q[\alpha]|)=1$
@Walterr if $\alpha, \beta, \gamma$ are the roots, then $f(a_1 \alpha+a_2 \alpha^2 +b_1 \beta +b_2 \beta^2 +c_1 \gamma +c_2 \gamma^2+d)=a_1 f(\alpha)+a_2 f(\alpha)^2+b_1 f(\beta)+b_2 f(\beta)^2 +c_1 f(\gamma)+c_2 f(\gamma)^2+d.$ Thus $f(l)$ for any $l \in L$ is determined by the action of $f$ on the three roots.
Oct
24
comment Prove that the number of automorphisms in $\mathbb Q[\alpha]$ equals $1$ $(|Aut\mathbb Q[\alpha]|)=1$
@Walterr I mean that one of $f(\alpha)=\alpha, f(\alpha)=\omega \alpha, f(\alpha)=\omega^2 \alpha$ will occur, and for each of these options you have $2$ choices as to what $f(\alpha \omega)$ is (which, along with $f(\alpha)$, determines $f(\omega^2 \alpha)$).
Oct
24
answered Prove that the number of automorphisms in $\mathbb Q[\alpha]$ equals $1$ $(|Aut\mathbb Q[\alpha]|)=1$
Oct
23
comment How to visualise Bollobas' 1965 theorem?
I have crossposted to MO.
Oct
23
answered Why in this sense this homomorphism is injective?
Oct
21
comment So why isn't $\Bbb R^n = \oplus _{n = 1}^{m}\Bbb R^n$
Decomposed uniquely.
Oct
20
revised How to visualise Bollobas' 1965 theorem?
added 444 characters in body
Oct
20
comment $|A\times B|= \text{max}(|A|,|B|)$ for infinite sets
I will accept an answer when I've read into this a little more.
Oct
20
revised How to visualise Bollobas' 1965 theorem?
edited body
Oct
20
revised How to visualise Bollobas' 1965 theorem?
edited title
Oct
20
asked How to visualise Bollobas' 1965 theorem?