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Hilbert's eleventh problem is one of David Hilbert's list of open mathematical problems posed in 1900. A furthering of the theory of quadratic forms, he stated the problem as follows:
- Our present knowledge of the theory of quadratic number fields puts us in a position to attack successfully the theory of quadratic forms with any number of variables and with any algebraic numerical coefficients. This leads in particular to the interesting problem: to solve a given quadratic equation with algebraic numerical coefficients in any number of variables by integral or fractional numbers belonging to the algebraic realm of rationality determined by the coefficients.
It is considered to have been addressed by Helmut Hasse's local-global principle in 1923 and 1924; see Hasse principle, Hasse-Minkowski theorem.
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