Apparaît dans les collections : Arithmetic geometry, representation theory and applications / Géométrie arithmétique, théorie des représentations et applications, The Fields Medallists, Fields medallists - 1986

For smooth schemes the category $MF$ (defined by Fontaine for DVR's) realises the "mysterious functor", and provides natural systems of coeffients for crystalline cohomology. We generalise it to schemes with semistable singularities. The new technical features consist mainly of different methods in commutative algebra