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- Prime Numbers P ($\mathbb{P}$): No positive divisors other than 1 and itself: 1, 3, 5, 7, 11, ...
- Natural Numbers N ($\mathbb{N}$): 0, 1, 2, 3
- Integers Z ($\mathbb{Z}$): ..., -3, -2, -1, 0, 1, 2, 3
- Irrational Numbers I ($\mathbb{I}$): π, 1.3333...
- Rational Numbers Q ($\mathbb{Q}$): any real number can be expressed by ration of two integers, such as 0.5 (1/2), 1.6 (8/5)
- Real Numbers R ($\mathbb{R}$):
- Complex Numbers C ($\mathbb{C}$)
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