Arithmetic Updated 2025-04-18 +Created 1970-01-01
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Definition: "easy" number theory learnt in primary school, notably the operations of addition, subtraction, multiplication and division.
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Metric induced by a norm Updated 2025-04-18 +Created 1970-01-01
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In a vector space, a metric may be induced from a norm by using subtraction:
(1)
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