# Symbols:Number Theory/Deprecated Symbols

## Deprecated Symbols of Number Theory

This page contains symbols which may or may not be in current use, but are either non-standard in mathematics or have been superseded by their more modern variants.

On $\mathsf{Pr} \infty \mathsf{fWiki}$ the intention is to present a consistent style, and so these symbols are to be considered deprecated.

### Divisor

- $x \mid y$

This means **$x$ is a divisor of $y$**.

The symbol $\mid$ has been (or is in the process of being) superseded by $\divides$, which is becoming increasingly popular since many mathematicians are of the opinion that $\mid$ is overused, and hence a possible cause for confusion.

The $\LaTeX$ code for \(\mid\) is `\mid`

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### Integer Part

- $\sqbrk x$

For $x \in \R$, the greatest integer less than or equal to $x$.

That is, it is the integer part of a given real number.

$\sqbrk x$ has been (or is in the process of being) superseded by $\floor x$, due to the already widespread uses of square brackets.

The $\LaTeX$ code for \(\sqbrk x\) is `\sqbrk x`

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