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Waring's conjecture

A hypothesis given, without proof, by the English mathematician Edward Waring (1734–1798) in his Meditationes algebraicae (1770). It states that for every number k, there is another number s such that every natural number can be represented as the sum of s kth powers. For example, every natural number can be written as a sum of 4 squares, 9 cubes and so on. Waring's conjecture was first proved in full by David Hilbert in 1909.

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