| 21. | In 1917, Mehmet Nadir published a book on the Number theory.
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| 22. | Robbins also did important nongovernmental work in algebra and number theory.
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| 23. | The properties of quadratic residues are widely used in number theory.
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| 24. | Just ask the National Security Council how interested they are in number theory.
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| 25. | He also wrote several books on the history of Number Theory.
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| 26. | His mathematical specialties included complex analysis, approximation theory and number theory.
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| 27. | This outcome is one example of the uses of number theory.
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| 28. | Wolff made many contributions to a number of mathematical fields, including number theory.
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| 29. | Further branches crucially applying groups include algebraic geometry and number theory.
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| 30. | He further advanced modular arithmetic, greatly simplifying manipulations in number theory.
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