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Lectures on padic Hodge theory and (φ, Γ)modules. zip

This is the notes for a series of lectures I gave at the Morningside Center, China, in Summer 2010. I tried to advocate the approach to padic Hodge theory via (φ, Γ)modules. 
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Semistable reduction of overconvergent Fisocrystals. pdf

This was a series of talks I gave in STAGE seminar at MIT. I sketched Kedlaya's approach to the semistable reduction conjecture for overconvergent Fisocrystals. 
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Ramification theory for local fields with imperfect residue fields. pdf

This is a summary of my two papers On Ramification Filtrations and padic Differential Equations, I, II . In this note, I focus on setting up the framework of the proof, without diving into the technical details. I hope this make the two papers more accessible. The introductory part was from a talk I gave in STAGE seminar at MIT. 