1 The Least Upper Bound: De nitions and Axiom

This document summarizes discussions of basics related to the least upper bound concept and axiom which are not in the book, or maybe in the book but di erent there from my inclass discussion. 1 The Least Upper Bound: De nitions and Axiom If Ais a set of numbers and bis a number, we say that bis an upper bound for Ai for every number x2Awe have ... ................
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