Properties of morphisms in the simplex category #
In this file, we show that morphisms in the simplex category
are generated by faces and degeneracies. This is stated by
saying that if W : MorphismProperty SimplexCategory
is
multiplicative, and contains faces and degeneracies, then W = ⊤
.
This statement is deduced from a similar statement for
the category SimplexCategory.Truncated d
.
theorem
SimplexCategory.morphismProperty_eq_top
(W : CategoryTheory.MorphismProperty SimplexCategory)
[W.IsMultiplicative]
(δ_mem : ∀ {n : ℕ} (i : Fin (n + 2)), W (δ i))
(σ_mem : ∀ {n : ℕ} (i : Fin (n + 1)), W (σ i))
: