Commit 2024-01-16 19:40 34368d1e
View on Github →fix(Data/Fin/Basic): castPred
consistency redefinition. (#9780)
This PR redefines castPred to be more consistent with the definition of both pred
and castSucc
, so that the relationship between castSucc
and castPred
and succ
and pred
becomes exactly analogous.
It also adds some supplementary and analogous lemmas designed to facilitate this.
As castPred
is no longer dependent on predAbove
, its definition is moved to a more appropriate place.