∀ (X Y : Type u_1),
  CategoryTheory.SemiCartesianMonoidalCategory.snd X Y =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.whiskerRight
        (CategoryTheory.SemiCartesianMonoidalCategory.isTerminalTensorUnit.from X) Y)
      (CategoryTheory.MonoidalCategoryStruct.leftUnitor Y).hom