... note that according to (1. 1.4) and (1. 1 .10 ),W = 1 2(R + L) (1. 1 .11 )and hence, using the binomial formula,Wn= 1 2nnk=0nkRkLn−k= 1 2nnk=0nkR2k−n= 1 2nnk=0nkLn−2k. ... motion were developed in the pioneering work by A Einstein (19 05, 19 06) (these fundamental works on Brownian motionwere reprinted in Einstein (19 26, 19 56)). 12 Brownian motion: introduction to the ... (19 79), Berezin (19 81) , Elliott (19 82), Glimm and Jaffe (19 87) andreferences therein. We shall follow, however, another line of exposition, having in mind a correspondingphysical problem in...