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begin quote ita"
CHAPTER I [:] Notions from Set Theory [...] 1. SETS AND ELEMENTS. SUBSETS. "end quote
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.

AN EXAMPLE POSTPONED

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.

begin quote ita-1-1-5-pg3 "
[...] if is the set of real numbers,
.
"end quote

on to reading 4