A condition in numerical equation solving which states that, given a space discretization, a time step bigger than some computable quantity should not be taken. The condition can be viewed as a sort of discrete "light cone" condition, namely that the time step must be kept small enough so that information has enough time to propagate through the space discretization.
Courant-Friedrichs-Lewy Condition
See also
Euler Forward MethodExplore with Wolfram|Alpha
References
Courant, R.; Friedrichs, K.; and Lewy, H. "On the Partial Difference Equations of Mathematical Physics." IBM J. 11, 215-234, 1967.Referenced on Wolfram|Alpha
Courant-Friedrichs-Lewy ConditionCite this as:
Weisstein, Eric W. "Courant-Friedrichs-Lewy Condition." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Courant-Friedrichs-LewyCondition.html