''Diophantine'' means pertaining to the ancient Greek mathematician
Diophantus. A number of concepts bear this name:
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Diophantine approximation
In number theory, the study of Diophantine approximation deals with the approximation of real numbers by rational numbers. It is named after Diophantus of Alexandria.
The first problem was to know how well a real number can be approximated ...
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Diophantine equation
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Diophantine quintuple
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Diophantine set
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