**READING: I §2 1**
Back to reading**:**
I §1 8

*begin quote ita***"**

*CHAPTER I* [:]
**
Notions from Set Theory
**

These pages assume that the reader has the book and is reading along. topic index contents

Please read these notes from the beginning to here, and then the third paragraph of §2.

For emphasis and an example, I would like to quote Rosenlicht's definition of the complement of a set.

*
begin quote
ita-1-2-3-pg5
*
**"**

If *X* is a subset of a set *S*, then the *complement of X in S* is the set of all elements of S which are not elements of *X* [...]

That is .

**"***end quote*

** Example:** Let