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bio website math.upenn.edu/~frankelb
location Philadelphia, PA
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I'm currently (fall 2013) a third year graduate student at the University of Pennsylvania. My thesis, still in its infancy, concerns maps from fundamental groups of complete curves over fields of positive characteristic into linear groups.


Nov
21
comment Prove that any subfield of $\Bbb R$ contains $\Bbb Q$
Your proof is correct, but could perhaps use some more details (why do you reach each conclusion?) Also, why doesn't your proof work for $\mathbb Z/p$? You must be using some property of $\mathbb R$, but you don't explicitly say what property you are using.
Nov
20
revised Fun Lagrange multiplier problem?
edited tags
Nov
17
comment Why every central simple algebra has a splitting field
@Dune The Tensor product of a central simple algebra with a simple algebra is always simple.
Nov
17
revised Why every central simple algebra has a splitting field
edited tags
Nov
9
comment A proposition on Mobius map
The only group-theoretic observation, which we can make without using the language of groups, is that given an automorphism $\psi$ with $\psi(a)=0$ for some $a$, we can write $\psi=\tau \circ \varphi_a$, where $\tau$ maps $0$ to $0$.
Nov
8
answered A proposition on Mobius map
Oct
21
revised product considering the period of index over a cyclotomic extension
added 31 characters in body; edited title
Oct
7
awarded  Nice Answer
Sep
30
reviewed Looks OK Thinking about a probability problem in terms of sets.
Sep
30
awarded  Explainer
Sep
24
awarded  Autobiographer
Sep
16
reviewed Approve suggested edit on Minimal Number of Generators of a Module
Sep
6
answered Degree of the field extension.
Sep
3
revised Where can I learn about Mathematical Philosophy?
edited tags
Aug
21
revised Replacing the “if $x ≤ y$, then $x + z ≤ y + z$” axiom in Reals.
added 17 characters in body; edited title
Aug
21
answered When can an infinite sum and complex integral be interchanged?
Aug
21
answered Infinite spaces in which all subsets are compact are not Hausdorff
Aug
20
answered Why this order is well-defined?
Aug
12
awarded  Popular Question
Jul
20
reviewed Reject suggested edit on How to $\int_{0}^\infty {\sin^3(x)\over x}dx$