English
The inclusion from H to K exists whenever H ≤ K.
Русский
Существует включение из H в K, если H ≤ K.
LaTeX
$$$H \le K \Rightarrow \text{inclusion}_{H\to K} : H \to K \text{ является моноид-гомоморфизм}$$$
Lean4
/-- The inclusion homomorphism from a subgroup `H` contained in `K` to `K`. -/
@[to_additive /-- The inclusion homomorphism from an additive subgroup `H` contained in `K` to `K`. -/
]
def inclusion {H K : Subgroup G} (h : H ≤ K) : H →* K :=
MonoidHom.mk' (fun x => ⟨x, h x.2⟩) fun _ _ => rfl