`BookProof.ChapterWeylSl2.Sl2Rep.cas_comm_apply_E` (v : V) : R.cas (R.E v) = R.E (R.cas v)

Initializing...

`BookProof.ChapterWeylSl2.Sl2Rep.cas_comm_apply_E` (v : V) : R.cas (R.E v) = R.E (R.cas v) · Prove2Me