内容简介
Whydidwewriteasecondedition?Aminorrevisionofthefirsteditionwouldhavebeenadequatetocorrectthe(admittedlymany)typographicalmistakes.However,manyofthenicecommentsthatwereceivedfromstu-dentsandcolleaguesalike,endedwitharemarkofthetype:"unfortunately,youdontdiscusstopicx".