62o ot2 =L0,(MeR3,1>t) 证明: a=0, ==f(M,t) ①u=0w(M,5x)dr→4o=0 8'u =Lu+f(M,1),(MeR,t>0) ②u=0w(M,)dr→ 1e0=0 -war+w(a儿 u-SW(M.t.t)dr -m→=0 (3) 0」◆产-mdr+ t2 8t -2d+=f+--0证明: 2 3 2 ,( , ) 0, , t t L M R t t f M t 2 3 2 0 0 , ,( , 0) t t 0, 0 u Lu f M t M R t t u u t . .0 , ; t u W M t d (1) . .0 , ; t u W M t d u t0 0 (2) . .0 , ; t u W M t d . .0 , ; , ; t t u W M t d W M t t t . .0 t W M t, ; d t t 0 0 u t . .0 u t W M t, ; d t t (3) 2 2 . 2 2 .0 t , ; , ; t u W M t W M t d t t t . .0 t , ; t W M t LWd t . .0 t , ; t W M t L Wd t Lu f M t ( , )