English
A multiplicative equivalence between groups preserves inversion: for every x in G, the image of x^{-1} equals the inverse of the image of x.
Русский
Умножающая эквивалентность между группами сохраняет обращение: для любого x в G образ x^{-1} равен обратному образу x.
LaTeX
$$$\forall x\in G:\ h(x^{-1}) = h(x)^{-1}$$$
Lean4
/-- A multiplicative equivalence of groups preserves inversion. -/
@[to_additive /-- An additive equivalence of additive groups preserves negation. -/
]
protected theorem map_inv [Group G] [DivisionMonoid H] (h : G ≃* H) (x : G) : h x⁻¹ = (h x)⁻¹ :=
map_inv h x