`BookProof.ChapterFreeFieldBornFiberBounds.bornFiber_card_eq_iff_posSupport_card_eq` {p q : ↥(stdSimplex ℝ (Fin n))} : Nat.card ↥(bornMapSphere n ⁻¹' {p}) = Nat.card ↥(bornMapSpher

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`BookProof.ChapterFreeFieldBornFiberBounds.bornFiber_card_eq_iff_posSupport_card_eq` {p q : ↥(stdSimplex ℝ (Fin n))} : Nat.card ↥(bornMapSphere n ⁻¹' {p}) = Nat.card ↥(bornMapSpher · Prove2Me