Mathlib Map

Theorems · Definition · algebraic topology

SSet.degenerate

(X : SSet) → (n : ℕ) → Set (X.obj (Opposite.op { len := n }))

An n-simplex of a simplicial set X is degenerate if it is in the range of X.map f.op for some morphism f : [n] ⟶ [m] with m < n.

Defined in
Mathlib.AlgebraicTopology.SimplicialSet.Degenerate
Cited by
29 results in Mathlib
Foundations
Depth 32 from the axioms · uses propext, Quot.sound

Around this declaration

Dashed lines are statement dependencies; solid lines are citations in proofs.

SSet.nonDegenerate · cited by 106SSet.nonDegenerateSSet.nonDegenerate_iff_of_mono · cited by 6SSet.nonDegenerate_iff_of…SSet.degenerate_eq_univ_of_hasDimensionLT · cited by 6SSet.degenerate_eq_univ_o…SSet.Subcomplex.mem_degenerate_iff · cited by 5Subcomplex.mem_degenerate…SSet.degenerate_eq_iUnion_range_σ · cited by 4SSet.degenerate_eq_iUnion…SSet.Subcomplex.mem_nonDegenerate_iff · cited by 4Subcomplex.mem_nonDegener…PartialOrder.mem_nerve_nonDegenerate_iff_strictMono · cited by 3PartialOrder.mem_nerve_no…SSet.degenerate_app_apply · cited by 3SSet.degenerate_app_applySSet.hasDimensionLT_of_epi · cited by 2SSet.hasDimensionLT_of_epiSSet.mem_degenerate_iff · cited by 2SSet.mem_degenerate_iffSSet.mem_degenerate_iff_notMem_nonDegenerate · cited by 2SSet.mem_degenerate_iff_n…SSet.mem_nonDegenerate_iff_notMem_degenerate · cited by 2SSet.mem_nonDegenerate_if…SSet.degenerate_iff_of_isIso · cited by 2SSet.degenerate_iff_of_is…SSet.degenerate_zero · cited by 2SSet.degenerate_zeroSSet.hasDimensionLT_iSup_iff · cited by 1SSet.hasDimensionLT_iSup_…DFunLike.coe · cited by 62936DFunLike.coeSet · cited by 53352SetQuiver.Hom · cited by 32603Quiver.HomCategoryTheory.Functor.obj · cited by 19642Functor.objCategoryTheory.Functor.map · cited by 8698Functor.mapOpposite · cited by 8081OppositeSet.ofPred · cited by 6101Set.ofPredSet.range · cited by 4705Set.rangeCategoryTheory.ConcreteCategory.hom · cited by 4022ConcreteCategory.homSimplexCategory · cited by 2204SimplexCategoryQuiver.Hom.op · cited by 1948Hom.opSSet · cited by 1283SSetSSet.degenerateCITED BYCITES

Cites12

Mathlib declarations this one mentions in its statement or cites explicitly in its proof. Plumbing is filtered out.

Cited by32

Results whose statement or proof uses this declaration.