**READING: I §4 5**
Back to reading**:**
I §4 4

*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 remainder of paragraph 4 of §4 (after the previous two readings).

Rosenlicht continues:

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begin quote
ita-1-4-4-pg11
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**"**

[...] On the other hand, if *X* is infinite then [see reading **I §4 2**] there exist distinct elements *x*, *x*, *x*,**...** in *x*. The compliment of { *x*, *x*, *x*,**...** } in *X* is a subset *Y*, so that

A one-one correspondence between