« first day (2374 days earlier)      last day (99 days later) » 

9:07 AM
This question was bumped recently (by a new answer): How misleading is it to regard $\frac{dy}{dx}$ as a fraction? I'd guess would fit there. (I am not sure what to choose as a top-level tag.)
77
Q: How misleading is it to regard $\frac{dy}{dx}$ as a fraction?

Frank ThorneI am teaching Calc I, for the first time, and I haven't seriously revisited the subject in quite some time. An interesting pedagogy question came up: How misleading is it to regard $\frac{dy}{dx}$ as a fraction? There is one strong argument against this: We tell students that $dy$ and $dx$ mean ...

 
 
10 hours later…
7:31 PM
YCor created a new tag , including a tag excerpt.
1
Q: Maximal dimension of abelian subalgebra of exceptional simple Lie algebra in positive characteristic

David CravenFor complex semisimple Lie algebras, the maximal dimension of an abelian subalgebra was determined by Mal'cev in 1945. For $E_7$, for example, it is $27$, and is the radical of the $E_6$ parabolic. What about in characteristic $p$ for $p>0$? I suspect the answer is nearly, but not quite, the sam...

12
Q: Which is the correct universal enveloping algebra in positive characteristic?

Theo Johnson-FreydThis is an extension of this question about symmetric algebras in positive characteristic. The title is also a bit tongue-in-cheek, as I am sure that there are multiple "correct" answers. Let $\mathfrak g$ be a Lie algebra over $k$. One can define the universal enveloping algebra $U\mathfrak g...

 

« first day (2374 days earlier)      last day (99 days later) »