\bs{p}-Adic Confluence of $\bs{q}$-Difference Equations

Abstract

We develop the theory of $p$-adic confluence of $q$-difference equations. The main result is the surprising fact that, in the $p$-adic framework, a function is solution of a differential equation if and only if it is solution of a $q$-difference equation. This fact implies an equivalence, called ``Confluence'', between the category of differential equations and those of $q$-difference equations. We obtain this result by introducing a category of ``sheaves'' on the disk ${\mathrm{D}}^{-}(1,1)$, whose stalk at 1 is a differential equation, the stalk at $q$ is a $q$-difference equation if $q$ is not a root of unity $\xi$, and the stalk at a root of unity is a mixed object, formed by a differential equation and an action of ${\sigma }_{\xi }$.

43 pages

Cited by in corpus (3)

• Floquet theory based on new periodicity concept for hybrid systems involving $q$-difference equations
• Formal confluence of quantum differential operators
• Twisted calculus on affinoid algebras