theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1
theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1: ∀ (v : qszr71sj.FiatSurface), qszr71sj.ContinuantFiatBoundary.Is (Subtype.val v)
theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1
theorem instCoeFiatSurfaceContinuantFiatBoundary._proof_1: ∀ (v : qszr71sj.FiatSurface), qszr71sj.ContinuantFiatBoundary.Is (Subtype.val v)