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Jul
27
accepted Prove that for $\alpha$ an ordinal, $\alpha \le \omega^\alpha$.
Jul
24
revised Cubic Planar Graphs have $2^m-1$ Hamilton Cycles, contradicting Bosak…
added 401 characters in body
Jul
24
answered Cubic Planar Graphs have $2^m-1$ Hamilton Cycles, contradicting Bosak…
Jul
23
revised Proving that if $p^2 = a^2 + 2b^2$ then also $p$ can be written in form $a^2 +2b^2$
added 1 character in body
Jul
23
comment Proving that if $p^2 = a^2 + 2b^2$ then also $p$ can be written in form $a^2 +2b^2$
With hindsight splitting into the three cases was unnecessary, you only need that $(p)$ splits into one or two prime ideals, but maybe it's instructional to leave it in.
Jul
23
answered Proving that if $p^2 = a^2 + 2b^2$ then also $p$ can be written in form $a^2 +2b^2$
Jul
11
comment For what functions is this theorem correct?
@joriki The cardinality. One of the conditions for the theorem to be true is surely that preimages are finite.
Jul
11
comment For what functions is this theorem correct?
@joriki Apologies, I meant preimage of an element in the image. I thought you were being sarcastic.
Jul
11
comment For what functions is this theorem correct?
@joriki How is that relevant?
Jul
9
comment For what functions is this theorem correct?
That is correct.
Jul
9
asked For what functions is this theorem correct?
Jun
23
comment Prove that for $\alpha$ an ordinal, $\alpha \le \omega^\alpha$.
Aha, thanks. I see.
Jun
23
comment Prove that for $\alpha$ an ordinal, $\alpha \le \omega^\alpha$.
My non-understanding lies elsewhere: why does the result follow from this?
Jun
23
asked Prove that for $\alpha$ an ordinal, $\alpha \le \omega^\alpha$.
Jun
16
awarded  Notable Question
May
11
accepted Closed form or asymptotic expansion for $\int_0^m \frac{n^x}{\Gamma(x+1)}dx$?
Apr
27
revised An integration question to be solved without using differentiation under the integral sign.
deleted 9 characters in body
Mar
23
comment Dirac delta implies continuous?
@Woodface I don't have a rigorous one.
Mar
20
comment Show that there are only finitely many subgroups of $F$ in which $H$ can be of finite index.
$F$ is free on how many generators?
Mar
20
asked Dirac delta implies continuous?