Most built-in procedures and functions are now represented as methods of standard objects rather than operators.

Many mathematical functions, such as factorial, are most naturally represented in a purely functional form.

A function f(z) is represented by a formal power series:

The function of the foghorn is represented symbolically in the form of a trumpet.

Presidents are free to determine what sub offices and functions will be represented in the staff structure.

Every entire function can be represented as a power series that converges everywhere in the complex plane, hence uniformly on compact sets.

Any continuous periodic function can be represented as a complex harmonic motion using its fourier series.

Multi-parameter functions can be represented with the technique of currying.

Sometimes each function is required to be a linear, or more generally an affine transformation and hence represented by a matrix.

Most main functions are also either written in English or represented as small pictograms.