# MAT 0670 Chapter Notes -Rational Number

## Document Summary

We start by pondering what a real number "truly" is before moving on to discussing what a function is because that is the topic of this course, "functions of one real variable. " The simplest numbers are the positive integer zero and the negative integers 1,2,3,4, 0. Other simple numbers are 4, 3, 2, and 1. The numbers that result from dividing one whole number by another (nonzero) whole number come next. These are the so-called rational numbers or fractions, such. 12, 13, 23, 14, 24, 43, 43, or\s 21, 13, 23, 41, 42, 43, 34, . Any entire number is a rational number by definition (in particular zero is a rational number. ) Any pair of rational numbers can be added to, subtracted from, multiplied, or divided, and the outcome will always be another rational number (so long as you don"t try to divide by zero).