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Courant–Friedrichs–Lewy condition

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It is an important stability criterion for hyperbolic equations.

In common case it's written as

C=c\frac{\Delta t}{\Delta x} \leq 1

where C is called the Courant number

Courant, R., K. O. Fredrichs, and H. Lewy (1928), "Uber die Differenzengleichungen der Mathematischen Physik", Math. Ann, vol.100, p.32, 1928.

Anderson, Lohn David (1995), "Computational fluid dynamics: the basics with applications", McGraw-Hill, Inc.

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