# What does A\B mean?

Hi, stupid question but what does A\B mean?

## Answers and Replies

chroot
Staff Emeritus
Science Advisor
Gold Member
You might want to provide some context to the question. Otherwise, it's meaningless.

It might mean "A divided by B" or "A given B" or any number of other things.

- Warren

Galileo
Science Advisor
Homework Helper
If A and B are sets:
$$A\setminus B=\{x\in A | x\notin B\}$$

Sometimes also written as A-B.