Commit 2023-07-18 21:46 15ef30fa
View on Github →feat: define NonUnitalStarSubalgebra
s and develop basic API (#5537)
This continues the non-unital-ization of mathlib
This PR also redefines StarSubalgebra.centralizer
so that it no longer requires the set s
provided to be closed under star
, and instead the carrier is just the Set.centralizer (s ∪ star s)
. Consequently, this changes some things in von Neumann algebras, where we now need to see that Set.centralizer (↑S ∪ star ↑S) = Set.centralizer ↑S
, where S
is a StarSubalgebra
. Therefore we add the simp
lemma StarMemClass.star_coe_eq
.