theorem CommunicativeArithmeticGuard.irreversible_boundary_requires_exact
theorem CommunicativeArithmeticGuard.irreversible_boundary_requires_exact: ∀ (boundary : Boundary), irreversible boundary → selectedBackend boundary = Backend.exact
theorem CommunicativeArithmeticGuard.irreversible_boundary_requires_exact
theorem CommunicativeArithmeticGuard.irreversible_boundary_requires_exact: ∀ (boundary : Boundary), irreversible boundary → selectedBackend boundary = Backend.exact