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## Natural Numbers

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 Numbers - Natural Numbers - Contents

The study of numbers begins with the natural numbers. The natural numbers are the whole numbers 1, 2, 3, 4, 5, etc. Early humans most likely created natural numbers for counting objects and measuring lines. An important part of early writing are the words representing these natural counting numbers. The classic ancient cultures, such as the Roman, Greek, Babylonian, and Sumerian civilizations all developed symbolic representations for natural numbers. Negative numbers and zero seemed to appear later in history. The natural numbers consist of all real rational numbers. Sets can also describe the natural numbers. They are the set of integers greater than zero or the set of positive integers. Unconventionally, zero is sometimes included in the natural numbers. Within the set of natural numbers the process of addition and multiplication of two numbers in math equations will always lead to another natural number. Basic math functions and higher math functions, such as geometric and trigonometric functions are also used to affect numbers.

 Numbers - Natural Numbers - Examples

The natural numbers are 1, 2, 3, 4, 5 . . .

 Numbers - Sections - Chapters 1 - Natural Numbers 2 - Zero 3 - Negative Numbers 4 - Integers 5 -Rational Numbers 6 - Common Fractions 7 - Decimal Fractions 8 - Irrational Numbers 9 - Absolute Value 10 - Infinity 11 - Special Numbers 12 - Prime Numbers 13 - Imaginary Numbers 14 - Systems of Numeration

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