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Oct 18, 2019 at 9:59 history closed LeechLattice
YCor
David Handelman
Mark Wildon
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Oct 18, 2019 at 9:01 answer added Dietrich Burde timeline score: 2
Oct 10, 2019 at 16:50 review Close votes
Oct 18, 2019 at 10:00
Oct 10, 2019 at 15:40 comment added YCor No. Up to conjugation, a copy of $sl_3$ in $sl_4$ is (the derived subalgebra of) the stabilizer of a $3+1$ decomposition $H\oplus L$. The intersection of any two such stabilizers contains a copy of $sl_2$. Hence the sum has dimension $\le 8+8-3=13$.
Oct 10, 2019 at 15:31 history asked Zhaoting Wei CC BY-SA 4.0