Linear and nonlinear Granger causality tests are used to examine the dynamic relation between daily Dow Jones stock returns and percentage changes in New York Stock Exchange trading volume. We find ...

Linear narratives are the most common form. Sometimes, however, a film might work better with a non-linear plot which presents some or all of the events in a non-chronological order.

None of this is magic, of course. Rather, as optics aficionado [Les Wright] explains, non-linear optics is all about physics.

O. L. Mangasarian, Linear and Nonlinear Separation of Patterns by Linear Programming, Operations Research, Vol. 13, No. 3 (May - Jun., 1965), pp. 444-452 ...