内容简介
THEpreviouseditionofthisvolumewasthelastbookonwhichIworkedtogetherwithmyteacherL.D.Landau.Therevisionandexpansionthatwethencarriedoutwasveryconsiderable,andaffectedeverychapter.Forthethirdedition,naturally,muchlessrevisionwasneeded.Nevertheless,afairamountofnewmaterialhasbeenadded,includingsomemoreproblems,andrelatingbothtorecentresearchandtoearlierresultsthathavenowbecomeofgreatersignificance.