Recall that a function can be thought of as a machine which takes an input in (say x) and then depending on what that input is, it returns an output (say y) by some predefined rule (say f). The graph ...

Investopedia / Zoe Hansen A hash is a mathematical function that converts an input of arbitrary length into an encrypted output of a fixed length. Thus, regardless of the original amount of data ...

In mathematics, a "well-defined" function is one where there is only 1 output for a given input (as a side note, you can have only single input functions, and still semantically get multiple ...