English
Frestricted Le is the restriction to a finite index set, seen as a finite family.
Русский
FrestrictLe — это ограничение до конечного множества индексов, рассматриваемое как конечное семейство.
LaTeX
$$$\\operatorname{frestrictLe}(a) = (Iic(a)).\\restrict (\\pi := \\pi)$$$
Lean4
/-- Restrict domain of a function `f` indexed by `α` to elements `≤ a`, seen as a finite set. -/
def frestrictLe (a : α) :=
(Iic a).restrict (π := π)