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The Grothendieck homotopy hypothesis
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Difficulty:🧠🧠🧠🧠🧠 Ages:13 - ∞
Skills:donuts, coffee cups Levels:1
Category:Topology Lean version:YES! ✔
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The Grothendieck homotopy hypothesis. Proves the Grothendieck homotopy hypothesis for ∞-groupoids associated with every Grothendieck coherator in the Ara–Henry convention: these algebraic objects recover the homotopy theory of spaces.

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released 2026-09-24  |  1 theorem · 10 lemmas · 22 proofs · 12,928 words  |  PLAY LEVEL 1 »  (pdf)
We prove the Grothendieck homotopy hypothesis for every Grothendieck coherator in the Ara–Henry convention: its weak globular infinity-groupoids recover the homotopy theory of spaces. We also resolve Henry's pushout conjecture, showing that elementary expansions preserve components and all homotopy groups of cellular infinity-groupoids.

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