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 Civic Duty
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Jan
15
accepted Is the category of finite sets small?
Jan
14
revised Is the category of finite sets small?
include more context.
Jan
14
comment Is the category of finite sets small?
Aha, that makes a lot of sense, especially given the next sentence below in the book. Let me update the question, then you can answer it for real.
Jan
14
asked Is the category of finite sets small?
Dec
16
answered Galois closure of a $p$-extension is also a $p$-extension
Dec
16
comment Galois closure of a $p$-extension is also a $p$-extension
This proof is wrong. There are elements $\sigma_i$ in the Galois group of $M/F$ that don't fix $K$. Therefore the Lemma is not applicable. Also this proof has not used that $K/F$ is Galois. This is necessary since otherwise $p=3$, $F=\mathbb{Q}$, $K=L=\mathbb{Q}(\sqrt[3]{2})$ would have a Galois closure with a 3-group as Galois group. In reality it has $S_6$.
Oct
28
awarded  Civic Duty
Oct
12
comment Is an irreducible ideal in $R$ irreducible in $R[x]$?
There is an answer to this question on mathoverflow: mathoverflow.net/questions/215768/…
Sep
24
awarded  Yearling
Sep
5
comment How to find the limit of this particular function?
Please also explain what you have tried and where you got stuck. This is a learning opportunity, even if within minutes somebody will just post the correct answer...
Sep
5
revised How to find the limit of this particular function?
Fix everything.
Sep
5
suggested approved edit on How to find the limit of this particular function?
Aug
31
accepted Sign patterns in kernel and rowspace of a matrix
Aug
31
answered Sign patterns in kernel and rowspace of a matrix
Aug
31
comment What is the Limit of the following Fibonacci Sequence?
Try using the matrix representation and the spectral theorem. This is going to be fun.
Aug
26
awarded  Citizen Patrol
Aug
26
revised As of August 2015, is the “set” of all gold medalists in the 2016 Olympics a set?
expand on time dependent sets to get more downvotes from logicians
Aug
26
comment As of August 2015, is the “set” of all gold medalists in the 2016 Olympics a set?
@CarlMummert I understand that you want to drag this question into logic, but as a "working mathematician" I would just define a time dependent set as a map from $\mathbb{R}$ to sets. I'll update my answer.
Aug
26
comment As of August 2015, is the “set” of all gold medalists in the 2016 Olympics a set?
So you have conclusively argued that the question should be closed as "not clear what you are asking"?
Aug
26
comment $P$ is a monic polynomial of degree $n$ , then which are correct?
Err, yes. This is funny.