English
There exists a canonical OneHom from α to Filter α sending a ↦ pure a, i.e., pureOneHom is the natural embedding of α into Filter α.
Русский
Существует канонический OneHom из α в Filter α, отправляющий a ↦ pure a; то есть pureOneHom — естественное вложение α в Filter α.
LaTeX
$$$\\text{pureOneHom} : \\text{OneHom } \\alpha (\\text{Filter } \\alpha)$ with toFun(a) = \\mathrm{pure}(a)$$
Lean4
/-- `pure` as a `OneHom`. -/
@[to_additive /-- `pure` as a `ZeroHom`. -/
]
def pureOneHom : OneHom α (Filter α) where toFun := pure; map_one' := pure_one