English
An invertible matrix P induces a Lie algebra automorphism on matrices by conjugation: A ↦ P A P^{-1}.
Русский
Обратимая матрица P индуцирует по отношению к матрицам автоморфизм Ли: A ↦ P A P^{-1}.
LaTeX
$$$P.lieConj h(A) = P A P^{-1}$ for invertible P and A a matrix.$$
Lean4
/-- An invertible matrix induces a Lie algebra equivalence from the space of matrices to itself. -/
def lieConj (P : Matrix n n R) (h : Invertible P) : Matrix n n R ≃ₗ⁅R⁆ Matrix n n R :=
((@lieEquivMatrix' R _ n _ _).symm.trans (P.toLinearEquiv' h).lieConj).trans lieEquivMatrix'