2. REAL AND COMPLEX NUMBER SYSTEM

One of he most common uses of numbers is in counting and measuring distances. The natural numbers were known as counting numbers. People were well acquainted with the use of natural numbers and fractions for measuring distances. We are surprised to learn that a Greek intellectual, Pythagoras in the middle of the sixth century B. C., Discovered that there are fractions. For example square root 2, square root 3, etc. He felt that corresponding to every distance there ought to be a number. Symbols 0, 1, 2, 3, 9 used to denote numbers are called numerals.