paper

A note on logarithmic growth of solutions of -adic differential equations without solvability

arXiv:1801.00771

Abstract

For a -adic differential equation solvable in an open disc (in a -adic sense), around 1970, Dwork proves that the solutions satisfy a certain growth condition on the boundary. Dwork also conjectures that a similar phenomenon should be observed without assuming the solvability. In this paper, we verify Dwork's conjecture in the rank two case, which is the first non-trivial result on the conjecture. The proof is an application of Kedlaya's decomposition theorem of -adic differential equations defined over annulus.

17 pages; v2: refereed; appendix 2 added to give an example

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