English
The opposite of the left unitor is given by a specific composite involving leftOp and opId.
Русский
Противоположность левого унитора задаётся через композицию с leftOp и opId.
LaTeX
$$$\\\\forall {C} [Category C], \\\\forall {F : CategoryTheory.Functor C D}, \\\\text{NatIso}.op F.leftUnitor = F.op.leftUnitor.symm \\\\llimes \\\\mathrm{isoWhiskerRight}(\\\\mathrm{Functor}.opId C).symm F.op \\\\llimes (\\\\mathrm{Functor}.opComp _ _).symm.$$$
Lean4
theorem op_leftUnitor :
NatIso.op F.leftUnitor =
F.op.leftUnitor.symm ≪≫ isoWhiskerRight (Functor.opId C).symm F.op ≪≫ (Functor.opComp _ _).symm :=
by cat_disch