By using the method of characteristics, find an explicit local solution
1 2 2
to u + ---[ ( u ) + x ] = 0, if t>0, x in R, with u(x,0) = (x^2)/2
t 2 x
請問這題要怎麼做呢??
我不知道要怎麼找這個特徵線..T.T
請給我提示.... 謝謝各位版友
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