Introduction to Complex Numbers: Navigating the Realm Beyond the Real
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How to Classify Numbers
To classify a number, check the sets from narrowest to widest: natural numbers (1, 2, 3, …), whole numbers (0, 1, 2, …), integers (… −2, −1, 0, 1, 2 …), rational numbers (any fraction of integers), and irrational numbers (like √2 and π); together the rational and irrational numbers make up the real numbers. […]
