ADJ.
differential, known, mean
VERB + NONLINEAR
film
NONLINEAR + NOUN
plot
PREP.
about, with
adj
Not lying on a straight line.
Whose atoms do not lie in a straight line.
Having a product of independent variables, or a variable with an exponent not equal to one.
Whose output is not directly proportional to its input.
Erratic and unpredictable; tending to jump back and forth.
a film with a nonlinear plot
In general, little is known about nonlinear second order differential equations.
"Nonlinear" does NOT mean "nonconvex".
Unfortunately, the equations in fluid mechanics introduce further difficulties, that is, they are nonlinear.
The narrative is nonlinear.