Thisvolumeisacompletelynewversionofthebookunderthesametitle，whichappearedin1981asVolume9intheseries"ProgressinMathematics，"andwhichhasbeenoutofprintforsometime.Thatbookhaditsorigininnotes（takenbyHassanAzad）fromacourseonthetheoryofLinearalgebraicgroups，givenattheUniversityofNotreDameinthefallof1978.Theaimofthebookwastopresentthetheoryoflinearalgebraicgroupsoveranalgebraicallyclosedfield，includingthebasicresultsonreductivegroups.Adistinguishingfeaturewasaself-containedtreatmentoftheprerequisitesfromalgebraicgeometryandcommutativealgebra.
