# What does A\B mean?

1. Mar 15, 2006

### physicsuser

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

2. Mar 15, 2006

### chroot

Staff Emeritus
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

3. Mar 15, 2006

### Galileo

If A and B are sets:
$$A\setminus B=\{x\in A | x\notin B\}$$

Sometimes also written as A-B.

4. Mar 15, 2006