The article How to calculate conditional subtotals in an Excel revenue sheet uses simple expressions, a function, and a conditional format to display a daily balance in a revenue sheet.

Whales gotta swim, and birds gotta fly – and when they do, they flap their wings and fins at a rate determined by the same simple mathematical expression and coefficient of proportionality.

Turning data into meaning information doesn't have to be hard; a few simple expressions and formatting might be all you need.

A compound expression consists of one or more simple expressions integrated into a larger expression via an operator, which is a sequence of instructions symbolically represented in source code.

Those of you not in the US can probably use this simple expression to render many of your holidays. The month and year arguments are literal values.