English
Dual of an IsCompl object maps to IsCompl in the dual setting: IsCompl x y → IsCompl (toDual x) (toDual y).
Русский
Двойственный образ IsCompl сохраняет IsCompl в двойственной задаче: IsCompl x y → IsCompl (toDual x) (toDual y).
LaTeX
$$$\text{IsCompl}(x,y) \rightarrow \text{IsCompl}(\text{toDual }x, \text{toDual }y)$$$
Lean4
theorem dual (h : IsCompl x y) : IsCompl (toDual x) (toDual y) :=
⟨h.2, h.1⟩