theorem CommunicativeArithmeticGuard.selectedBackend.eq_3
theorem CommunicativeArithmeticGuard.selectedBackend.eq_3: j81b1gmr.CommunicativeArithmeticGuard.selectedBackend j81b1gmr.CommunicativeArithmeticGuard.Boundary.externalAction = j81b1gmr.CommunicativeArithmeticGuard.Backend.exact