Thisbookmaybeusedasatextbookforthefirstorsecondyeargraduatestudentwhoisstudyingconcurrentlysuchtopicsastheoryofcomplexanalysis，classicalmechanics，classicalelectrodynamics，andquantummechanics.Inatextbookonstatisticalmechanics，itiscommonpracticetodealwithtwoim-portantareasofthesubject：mathematicalformulationofthedistributionlawsofsta-tisticalmechanics，anddemonstrationsoftheapplicabilityofstatisticalmechanics.　　　　本书为英文版。