# Function - History Of Functions, Characteristics Of Functions, Classification Of Functions

Science EncyclopediaScience & Philosophy: *Formate* to *Gastropoda*

A function represents a mathematical relationship between two sets of **real numbers**. These sets of numbers are related to each other by a rule which assigns each value from one set to exactly one value in the other set. The standard notation for a function y = f(x), developed in the 18th century, is read "y equals f of x." Other representations of functions include graphs and tables. Functions are classified by the types of rules which govern their relationships including; algebraic, trigonometric, and logarithmic and exponential. It has been found by mathematicians and scientists alike that these elementary functions can represent many real-world phenomena.

## Additional topics

- Function - History Of Functions
- Function - Characteristics Of Functions
- Function - Classification Of Functions
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