You are Here: Home >< Maths

# What does this mean (functions) watch

1. \ {-1} \ {1}
2. The backslash '\' means 'not including'.

So your thing basically says that 'f' is a function mapping from the set of real numbers (not including -1) to the set of real numbers (not including 1).

EDIT: For example, if you had a set X = {0,1,2,3,4,5}. Then the set X \ {2} would be the set {0,1,3,4,5}.
3. (Original post by claret_n_blue)
The backslash '\' means 'not including'.

So your thing basically says that 'f' is a function mapping from the set of real numbers (not including -1) to the set of real numbers (not including 1).

EDIT: For example, if you had a set X = {0,1,2,3,4,5}. Then the set X \ {2} would be the set {0,1,3,4,5}.
Cheers

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 14, 2013
Today on TSR

### Struggling to get going with your revision?

Get going with the all day revision thread

### Uni strikes! How do they affect you?

Discussions on TSR

• Latest
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE