Structure

category of simplicial sets

Notation sSet\sSet Objects simplicial sets, i.e. functors Δop→Set\Delta^{\op} \to \Set where Δ\Delta denotes the simplex category. Morphisms natural transformations Related Δ\Delta, Top\Top, M−SetM{-}\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

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Special objects

  • terminal object: simplicial set XX with Xn={∗}X_n = \{\ast\}
  • initial object: simplicial set XX with Xn=∅X_n = \varnothing
  • products: pointwise defined direct product
  • coproducts: pointwise disjoint union

Special morphisms

Functors

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