CatDat

category of simplicial sets

  • notation: sSet\mathbf{sSet}
  • objects: simplicial sets, i.e. functors ΔopSet\Delta^{\mathrm{op}} \to \mathbf{Set} where Δ\Delta is the simplex category
  • morphisms: natural transformations
  • Related categories: Top\mathbf{Top}Δ\Delta
  • nLab Link

Satisfied Properties

Properties from the database

Deduced properties

Unsatisfied Properties

Properties from the database

Deduced properties*

*This also uses the deduced satisfied properties.

Unknown properties

Special objects

  • terminal object: simplicial set XX with Xn=1X_n = 1
  • initial object: simplicial set XX with Xn=X_n = \varnothing
  • products: pointwise defined direct product
  • coproducts: pointwise disjoint union

Special morphisms

  • isomorphisms: natural isomorphisms
  • monomorphisms: pointwise injective transformations
  • epimorphisms: pointwise surjective transformations
  • regular monomorphisms: same as monomorphisms
  • regular epimorphisms: same as epimorphisms