`BookProof.ChapterFreeFieldBornFiberStabilizer.bornFiber_card_mul_signStab_card` (x : ↥(Metric.sphere (0 : EuclideanSpace ℝ (Fin n)) 1)) : Nat.card ↥(bornMapSphere n ⁻¹' {bornMapSp

Initializing...

`BookProof.ChapterFreeFieldBornFiberStabilizer.bornFiber_card_mul_signStab_card` (x : ↥(Metric.sphere (0 : EuclideanSpace ℝ (Fin n)) 1)) : Nat.card ↥(bornMapSphere n ⁻¹' {bornMapSp · Prove2Me