English
If a and b are related by antisymmetry of ≤, then IncompRel ≤ a c is equivalent to IncompRel ≤ b c for all c.
Русский
Если a и b связаны антисимметрией ≤, то для любого c несопоставимость a с c эквивалентна несопоставимости b с c.
LaTeX
$$$\\forall a\\ b\\ c, AntisymmRel(\\le) \\ a \\ b \\rightarrow IncompRel(\\le) \\ a \\ c \\leftrightarrow IncompRel(\\le) \\ b \\ c$$$
Lean4
theorem incompRel_congr_left (h : AntisymmRel (· ≤ ·) a b) : IncompRel (· ≤ ·) a c ↔ IncompRel (· ≤ ·) b c :=
h.incompRel_congr AntisymmRel.rfl