English
The geometric multiplicity (dimension of eigenspace) of μ is at most the algebraic multiplicity given by the rootMultiplicity.
Русский
Геометрическая кратность эйгензначения μ не превосходит алгебраическую кратность, задаваемую rootMultiplicity.
LaTeX
$$finrank K (φ.eigenspace μ) ≤ φ.charpoly.rootMultiplicity μ$$
Lean4
/-- The geometric multiplicity of an eigenvalue is at most the algebraic multiplicity. -/
theorem finrank_eigenspace_le (φ : Module.End K M) (μ : K) :
finrank K (φ.eigenspace μ) ≤ φ.charpoly.rootMultiplicity μ :=
finrank_genEigenspace_le ..