P\'{e}riodicit\'{e} de Kn\"{o}rrer \'{e}tendue
  We study the deformation theory aspects of Matricial Factorizations, possibly with an orthogonal or symplectic structure. We discuss and extend the Kn\"orrer and Hori-Walcher periodicity theorems 
Jos\'e Bertin (IF), Fabrice Rosay (IF)