RayVector.coe_neg

∀ {M : Type u_2} [inst : AddCommGroup M] {R : Type u_4} (v : RayVector R M),
  ↑((RayVector.equiv R M) (-v)) = -↑((RayVector.equiv R M) v)

Negating a nonzero vector commutes with coercion to the underlying module.

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