偏微分方程数值解法\partial_t f(t,x,y) + \partial_x (a(t,x,y) f(t,x,y)) + \partial_y (b(t,x,y) f(t,x,y))=0,初值f(0,x,y) ,边值f(t,-L,y),f(t,L,y),f(t,x,-s),f(t,x,s),系数a(t,x,y),b(t,x,y)已知.求0\partial_t 表示对t求偏导。To wacs5
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