**READING: I §1 3**
Back to reading**:**
I §1 2

*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 paragraph 5 of §1.

On page three of ** ita** there is another example of the equality of sets which are differently defined. I mention it here only to propose that it be postponed until after chapter two, because then we will have the real number system.

[...] if is the set of real numbers,