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 Jun 8 awarded Caucus Nov 25 comment Interesting calculus problems of medium difficulty? @Srivatsan did you consider it for f(x)=x? Oct 11 awarded Nice Question Sep 23 awarded Nice Question Jul 28 awarded Nice Answer 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 in $(x^2+1)\vert_{x = 4}$ or $\left.\left(\frac{x^3}{3}+x+c\right) \right\vert_0^4$? @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 in $(x^2+1)\vert_{x = 4}$ or $\left.\left(\frac{x^3}{3}+x+c\right) \right\vert_0^4$? 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 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. :)