feat(order/filter,topology/instances/nnreal): upgrade some lemmas to iff
#18964
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codisjoint.inf_left_sup_inf_right
andis_compl.le_inf_sup_inf
.filter.comap_ite
,filter.comap_max
, andfilter.tendsto_ite
.real.map_to_nnreal_at_top
,real.comap_to_nnreal_at_top
, andreal.tendsto_to_nnreal_at_top_iff
.tendsto_real_to_nnreal
tofilter.tendsto.real_to_nnreal
so that it can be used with dot notation.
ennreal.tendsto_of_real_nhds_top
.I'm cleaning up old local branches. I don't remember why I wanted to
have these lemmas but IMHO upgrading from implications to
iff
s is agood thing.