Algebraic Geometry Codes Basic Notions Michael Tsfasman Serge Vlˇ adut ¸ Dmitry Nogin Poncelet Laboratory (CNRS and Independent University of Mos- cow); Institut de Mathematiques de Luminy; Institute for Information Transmission Problems E-mail address : tsfasman@iml.univ-mrs.fr Institut de Mathematiques de Luminy; Institute for Information Transmission Problems E-mail address : vladut@iml.univ-mrs.fr Insitute for Information Transmission Problems E-mail address : nogin@iitp.ru