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Theorems · Definition · algebraic topology

SSet.S.IsUniquelyCodimOneFace.index

{X : SSet} → {x y : X.S} → x.IsUniquelyCodimOneFace y → {d : ℕ} → x.dim = d → Fin (d + 2)

When a d-dimensional simplex x is a 1-codimensional face of y, this is the only i : Fin (d + 2), such that X.δ i y = x (with an abuse of notation: see δ_index and δ_eq_iff for well typed statements).

Defined in
Mathlib.AlgebraicTopology.SimplicialSet.AnodyneExtensions.IsUniquelyCodimOneFace
Cited by
14 results in Mathlib
Foundations
Depth 91 from the axioms · uses propext, Classical.choice, Quot.sound

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