Skew-symmetric / skew-hermitian matrices #42
Description
Define Skew-symmetric and skew-Hermitian matrices, and prove cool properties from their Wikipedia pages.
These are also called anti-symmetric / anti-Hermitian, maybe do a literature search to see what's more common.
Maybe also link it to StarModule.selfAdjointPart_add_skewAdjointPart to show that every matrix is the sum of a Hermitian matrix and a skew-Hermitian matrix.