English
For a LinearOrder α with IsWellOrder α (· < ·), cof of the type with < is equal to cof of the type with ≤; i.e., cof_type_lt identifies these cofactors.
Русский
Для линейного порядка α с WellOrder α (мелким) cof типа с символом < совпадает с cof типа с ≤.
LaTeX
$$$\\operatorname{cof\_type} \\; := \\text{(см. текст)}$$$
Lean4
theorem cof_type_lt [LinearOrder α] [IsWellOrder α (· < ·)] : (@type α (· < ·) _).cof = @Order.cof α (· ≤ ·) := by
rw [cof_type, compl_lt, swap_ge]