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@yurekami yurekami commented Feb 7, 2026

Summary

  • Formalizes Gottschalk's conjecture (1973): every group is surjunctive.
  • Defines the left shift action, shift-equivariance, and surjunctivity.
  • Includes the classical result that finite groups are surjunctive (as a separate sorry'd theorem).

Closes #2152

Split from #2197 per reviewer request.

Formalize Gottschalk's conjecture (1973) that every group is
surjunctive, along with the classical result that finite groups
are surjunctive.

Closes google-deepmind#2152
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Gottschalk's Surjunctivity Conjecture

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