English
The germ corresponding to a global function is the same as the image under the quotient map by germSetoid.
Русский
Жермен глобальной функции равен образу этой функции по фактор-мэппингу через germSetoid.
LaTeX
$$$\text{ofFun} : (\alpha \to \beta) \to \mathrm{Germ}(l, \beta) = \mathrm{Quotient}(\text{germSetoid}(l, \beta)).$$$
Lean4
/-- The germ corresponding to a global function. -/
@[coe]
def ofFun : (α → β) → Germ l β :=
@Quotient.mk' _ (germSetoid _ _)