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 Yearling
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May
19
answered Can a nonempty set ever equal its Cartesian product with another set?
May
19
asked Determine the galois group of a quartic
May
16
answered Galois over Galois
May
6
comment Prove that the map $\theta(f(\alpha))=f^\sigma(\beta)$ is injective
I don't know how I missed this detail, thanks.
May
6
accepted Prove that the map $\theta(f(\alpha))=f^\sigma(\beta)$ is injective
May
6
revised Prove that the map $\theta(f(\alpha))=f^\sigma(\beta)$ is injective
added 66 characters in body
May
6
asked Prove that the map $\theta(f(\alpha))=f^\sigma(\beta)$ is injective
Apr
24
accepted Simplest way to prove that $e^{ix}$ is an open mapping into $S^1$
Apr
23
comment Simplest way to prove that $e^{ix}$ is an open mapping into $S^1$
how do you choose the $V$ exactly?
Apr
22
asked Simplest way to prove that $e^{ix}$ is an open mapping into $S^1$
Feb
17
accepted The free group given by $\langle a,b:a^2=b^3=e\rangle$ is not abelian.
Feb
17
comment The free group given by $\langle a,b:a^2=b^3=e\rangle$ is not abelian.
@StevenStadnicki Good, So you add another relation to get the $S_3$ and if $G$ were abelian then $S_3$ would be abelian as well after applying the 4th isomorphism theorem. Great, Could you make your comment an answer?
Feb
16
asked The free group given by $\langle a,b:a^2=b^3=e\rangle$ is not abelian.
Feb
13
awarded  Yearling
Jan
29
comment Sequence in an uncountable set of real numbers
@OohAah I see there is a slight difference, but if one changes $B\cap S\text{ is countable}$ by $B\cap S=\{x\}$, isn't the proof the same as Brian's? :)
Jan
29
comment Sequence in an uncountable set of real numbers
@OohAah In this question math.stackexchange.com/questions/310113/… Brian M. Scott actually proves something so much better.
Jan
29
comment Sequence in an uncountable set of real numbers
@OohAah I see it now, I just have to prove that the set of limit points of $A$ is uncountable.
Jan
29
comment Sequence in an uncountable set of real numbers
@OohAah It has to be injective
Jan
29
asked Sequence in an uncountable set of real numbers
Jan
27
comment Measurability Question?
Just to be clear, we are assuming each $f_n:X\to \mathbb{R}$?