books.google.com - This research monograph develops an arithmetic analogue of the theory of ordinary differential equations: functions are replaced here by integer numbers, the derivative operator is replaced by a ``Fermat quotient operator'', and differential equations (viewed as functions on jet spaces) are replaced...https://books.google.com/books/about/Arithmetic_Differential_Equations.html?id=aqwYKFjW5nwC&q=degree&utm_source=gb-gplus-shareArithmetic Differential Equations

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## Arithmetic Differential EquationsBy Alexandru Buium |