Question

History of number system ​

Answer 1

The Egyptians invented the first ciphered numeral system, and the Greeks followed by mapping their counting numbers onto Ionian and Doric alphabets. ... The key to the effectiveness of the system was the symbol for zero, which was developed by ancient Indian mathematicians around 500 AD.

Real: The limit of a convergent sequence of rational numbers

Complex: a + bi where a and b are real numbers and i is a formal square root of −1j

Answer 2

hope it helps you dear and always be happy