# argument

1. In the mathematics of functions, an argument is the dependent variable. For example, in the function *f *(*x*) = *x*^{ 2} + 3, *x* is
the argument.

2. In complex numbers, an argument is the angle between *ZO*, where *Z* is the point representing a complex
number on an Argand diagram and *O* is the origin, and the real axis.

3. An argument is also a mathematical proof, possibly an informal one. See logic.