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Quasi-categories in Lean

The general goal of this project is to formalize basic theory of quasi-categories. Most of the work is based on Kerodon.

The current goal is 0066: the internal hom between quasi-categories is again a quasi-category. This has been reduced to 0077 and 007F.

Remaining tasks:

  • the collection of monomorphisms of simplicial sets is stable under transfinite composition
  • the maps $B(k - 1) \hookrightarrow B(k)$ belong to $T'$ (requires simplicial subset and skeleton API)
  • the pushout-product of $\partial\Delta^m \hookrightarrow \Delta^m$ with $\Lambda^2_1 \hookrightarrow \Delta^2$ is inner anodyne for $0 \le m$ (requires simplicial subset API)
  • the class of inner anodyne morphisms is generated by inner horn inclusions (should be done when #20245 is merged)

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Formalizing quasi-categories in Lean

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