# Threshold Function

In math, a **threshold function** is a special class of step function, with a definition of the kind:

Some things to note about this function.
First, it only has 2 different values for its output: 1 and 0.
Second, the place where it changes from 0 to 1 (and vice versa) is at the input value of `T`

.
Third is that a *threshold function* is **not** a continuous function, however a left continuous function.

## Usage

*Threshold functions* have wide usage. One example is with some types of artificial neurons.