English
The range of a composition with a linear equivalence equals the range of the second map, under surjectivity hypotheses.
Русский
Объем образа композиции с линейной эквивалентностью равен образу второй карты при предположении сюръективности.
LaTeX
$$theorem range_comp [RingHomSurjective σ₂₃] [RingHomSurjective σ₁₃] :\\n LinearMap.range (h.comp e.toLinearMap) = LinearMap.range h$$
Lean4
@[simp]
protected theorem _root_.LinearEquivClass.range [Module R M] [Module R₂ M₂] {F : Type*} [EquivLike F M M₂]
[SemilinearEquivClass F σ₁₂ M M₂] (e : F) : LinearMap.range e = ⊤ :=
LinearMap.range_eq_top.2 (EquivLike.surjective e)