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Over the centuries mathematicians have come to recognise that it's useful to talk about different types of number. These include: [[[> IMG:NumberTypeEulerDiagram.png ]]] * Counting numbers ** which may or may not include zero * Prime numbers * Perfect numbers * Square numbers, Cubic numbers, /etc/ * Whole numbers ** Also known as the integers * Rational numbers ** Also known as fractions * Irrational numbers ** Algebraic numbers _ !/ (Although rational numbers are also Algebraic numbers) !/ ** Transcendental numbers * Real numbers As time has gone by, the usual number line has been extended, and we can also talk about: * Imaginary numbers * Complex numbers * Quaternions * Octinions * Algebraic extensions ---- CategoryMetaTopic