9:07 AM
specific-question This question was bumped recently (by a new answer): How misleading is it to regard $\frac{dy}{dx}$ as a fraction? I'd guess differential-calculus would fit there. (I am not sure what to choose as a top-level tag.)
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I 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
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Q: Maximal dimension of abelian subalgebra of exceptional simple Lie algebra in positive characteristic
For 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...
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