A necessary condition for the emergence of chaos is given. It is well known that the emergence of chaos requires a positive exponent which entails diverging trajectories. Here we show that this is not enough. An additional necessary condition for the emergence of chaos in the region where the trajectory of the system goes through, is that the product of the maximal positive exponent times the duration in which the system configuration point stays in the unstable region should exceed unity. We give a theoretical analysis justifying this result and a few examples. We stress that the criterion suggested involves only local exponents and {\bf is not} concerned with asymptotic defined exponents.

A. Yahalom, M. Lewkowicz, J. Levitan, G. Elgressy, L.P. Horwitz, and Y. Ben-Zion, ‎‎"Uncertainty Relation for Chaos" International Journal of Geometric Methods in Modern Physics. DOI: 10.1142/S0219887815500930.‎ Vol. 12 (2015) 1550093 (12 pages), © World Scientific Publishing Company.