chore: forward-port leanprover-community/mathlib#18558 #2719
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Mar 8, 2023
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…18558) This: * Generalizes `is_self_adjoint.smul`, which makes it easier to show that `0.5 • x` is self-adjoint when `x` is, even if `0.5` is a complex number. * Generalizes `is_self_adjoint.add` to match `matrix.is_hermitian.add` (for a later refactor), along with many other lemmas. * Removes re-proofs of `star_nat_cast` and `star_int_cast`. The first is motivated by showing that `exp K m` for some matrix `m` is positive definite if `is_self_adjoint m`. Forward-ported at leanprover-community/mathlib4#2719.
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Duplicate of #3159 |
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