category of simplicial sets

Notation sSet\sSet Objects simplicial sets, i.e. functors ΔopSet\Delta^{\op} \to \Set where Δ\Delta denotes the simplex category. Morphisms natural transformations Related Δ\DeltaTop\TopMSetM{-}\Set External nLab Link

The category of simplicial sets provides a fundamental combinatorial framework for representing spaces and \infty-categories, with applications throughout algebraic topology, higher category theory, and homological algebra.

Satisfied Properties

Assigned properties

Deduced properties

Unsatisfied Properties

Assigned properties

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

Functors

The database stores 1 functor based on the category of simplicial sets.