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Published 20 hours ago • verified publisher icon leanprover-community

feat: reflections, inversion sequences in Coxeter groups

Open trivial1711 opened this issue 11 months ago • 5 comments

  • Add theorem List.length_eraseIdx_add_one to Data/List/Basic.lean, which states that if i < l.length, then the length of l.eraseIdx i plus one is equal to the length of l.
  • Add new file GroupTheory/Coxeter/Inversion.lean. Define reflections, left inversions, right inversions, and inversion sequences. Prove their basic properties.

I decided to split #11408 (now closed) into two pull requests. This is the second one. The first is #11465.

  • [x] depends on: #11465

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trivial1711 avatar Mar 18 '24 02:03 trivial1711