# What does A\B mean?

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

Staff Emeritus
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

$$A\setminus B=\{x\in A | x\notin B\}$$