English
For any F: C ⥤ D, the core-left unitor identity aligns with the standard left unitor via cores and whiskering: F.leftUnitor.core = (𝟭 C).coreComp F ≪≫ isoWhiskerRight (Functor.coreId C) ∘ F.core.leftUnitor.
Русский
Для функтoра F: C ⥤ D ядро левого единичного унитора совпадает с обычной левой ед. через ядра и whisker: …
LaTeX
$$$ F.leftUnitor.core = (\\mathbf{1}_C).\\mathrm{coreComp} F ≪≫ \\mathrm{isoWhiskerRight}(\\mathrm{Functor.coreId}\; C) \\;\\ll≫\\; F.\\mathrm{core.leftUnitor} $$$
Lean4
theorem coreLeftUnitor {F : C ⥤ D} :
F.leftUnitor.core = (𝟭 C).coreComp F ≪≫ isoWhiskerRight (Functor.coreId C) _ ≪≫ F.core.leftUnitor := by cat_disch