English
If α carries a GradeBoundedOrder structure, then α itself can be endowed with a trivial grading by the identity map, i.e., grade a = a, isMin_grade a = a, isMax_grade a = a, etc.
Русский
Если α имеет структуру GradeBoundedOrder, то можно на α ввести тривиальную градацию по тождественному отображению: grade a = a, isMin_grade a = a и т.д.
LaTeX
$$$\\\\text{GradeBoundedOrder on } α \\text{ with } \\operatorname{grade} = \\mathrm{id}_{α}$$$
Lean4
instance toGradeBoundedOrder : GradeBoundedOrder α α
where
grade := id
isMin_grade _ := id
isMax_grade _ := id
grade_strictMono := strictMono_id
covBy_grade _ _ := id