Provide "lookup" and commuting lemmas as equations that always apply, and fix some inconsistent lemma naming
!507 (closed) ballooned into this huge change. This contains the following two MRs:
There is more that could be done, but that is postponed (we should probably open an issue):
-
non_empty
change as discussed in !526 (comment 97794) -
Direction of equality in fmap
/omap
/alter
lemmas, see !531 (comment 97789)
Edited by Ralf Jung