Approximation for Frobenius algebraic equations in Witt vectors

@inproceedings{Blair2010ApproximationFF,
  title={Approximation for Frobenius algebraic equations in Witt vectors},
  author={Luc B{\'e}lair},
  year={2010}
}
We prove an approximation property for solutions to difference equations in excellent discrete valuation rings satisfying an appropriate Hensel’s lemma, analog to a theorem of Greenberg [Publ. Math. IHES 31 (1966) 59-64]. In the case of Witt vectors we obtain a Nullstellensatz for Frobenius algebraic equations. 

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