Theorems · Definition · nonassociative algebras

RootPairing.coxeterWeight

{ι : Type u_1} →
  {R : Type u_2} →
    {M : Type u_3} →
      {N : Type u_4} →
        [inst : CommRing R] →
          [inst_1 : AddCommGroup M] →
            [inst_2 : Module R M] → [inst_3 : AddCommGroup N] → [inst_4 : Module R N] → RootPairing ι R M N → ι → ι → R

The Coxeter Weight of a pair gives the weight of an edge in a Coxeter diagram, when it is finite. It is 4 cos² θ, where θ describes the dihedral angle between hyperplanes.

Defined in

Mathlib.LinearAlgebra.RootSystem.Defs

Cited by

10 results in Mathlib

Foundations

Depth 35 from the axioms · uses propext, Quot.sound

Assumes

CommRingAddCommGroupModuleAddCommGroupModule