English
Whiskering on the right distributes over composition of natural transformations.
Русский
Правый whisker-операция распределяется по композиций натуральных трансформаций.
LaTeX
$$$\\mathrm{whiskerRight}(f \\circ g, I) = \\mathrm{whiskerRight}(f,I) \\circ \\mathrm{whiskerRight}(g,I)$$$
Lean4
theorem comp_whiskerRight {F G H : EnrichedFunctor V C D} (α : F ⟶ G) (β : G ⟶ H) (I : EnrichedFunctor V D E) :
whiskerRight ⟨α.out ≫ β.out⟩ I = whiskerRight α I ≫ whiskerRight β I :=
by
ext X
simp only [whiskerRight_out_app, NatTrans.comp_app, EnrichedFunctor.category_comp_out, EnrichedFunctor.forget,
EnrichedFunctor.comp_obj, EnrichedFunctor.comp_map]
simp [← ForgetEnrichment.homOf_comp]