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Math Grad Student


Jul
27
answered Direct sum of an algebra and its opposite
Jul
23
comment Equalizers in category of sets/graphs — a couple of examples
Using latex and a more standard mathematical presentation style. In particular, don't be afraid to write sentences.
Jul
21
awarded  Yearling
Jul
20
comment What is the name of the vertical bar?
@Zhen Lin, I would say that depends on the usage, I have no spacing issues for using it in set-builder notation or restrictions. Moreover you forgot to mention the \left. However we are deviating quite far from the point of the question. My comment was meant as a joke.
Jul
20
comment What is the name of the vertical bar?
it's called \mid, at least if you are a TeXnitian. :)
Jul
8
comment Direct sum of an algebra and its opposite
@Pete L. Clark, yes, this is definitely the thrust of my question, why the heck is it the universal enveloping algebra of anything?
Jul
7
accepted Direct sum of an algebra and its opposite
Jul
7
comment Direct sum of an algebra and its opposite
ok great. Thanks.
Jul
7
revised Direct sum of an algebra and its opposite
added 78 characters in body
Jul
7
comment Direct sum of an algebra and its opposite
Yes, that is a good point about dimensionality. Can you point me to a statement of this so I can at least remember what I was thinking of?
Jul
7
asked Direct sum of an algebra and its opposite
Jul
6
comment How to draw a weight diagram?
You have a lot of questions here, and maybe someone will come along and answer them all systematically for your specific example(though you don't tell us what n is), but let me just say this: take a look at chapter 12 of Fulton and Harris, books.google.com/…, I think that reading through this example will make this more clear.
Jun
17
comment Do complex numbers really exist?
Whoa! First to 100! Congrats!
Jun
9
comment Mathematical precise definition of a PDE being elliptic, parabolic or hyperbolic
@Willie Wong, You're awesome.
Jun
4
comment What is the connection between Grothendieck's Differential Operators and Hochschild Cohomology
Sorry, but I have a few more questions, first is $\mathcal{O}$ the same as $A$ here? Second, what do you mean de Rham of $A$? If you mean de Rham on the variety with coordinate ring $A$, then how is that different than the topological de Rham. Sorry if these questions are stupid.
Jun
4
comment What is the connection between Grothendieck's Differential Operators and Hochschild Cohomology
hehe, thanks @Pete L. Clark and @Mariano, the edit was what I intended. :)
Jun
4
asked What is the connection between Grothendieck's Differential Operators and Hochschild Cohomology
May
21
awarded  Good Answer
May
17
revised Lifting maps of quotient modules
deleted 4 characters in body
May
17
comment Lifting maps of quotient modules
Right again... sorry.