x*****d
发帖数: 427 | 1 (d_x)^2(u)-(d_y)^2(u)=f, f C^infinity
but u not C^infinity
any example?
Thanks | g******a
发帖数: 69 | 2 g(t) is a continous function (not differetiable). Intergrate twice
get G(t). Let u(x,y)=G(x+y)
【在 x*****d 的大作中提到】
: (d_x)^2(u)-(d_y)^2(u)=f, f C^infinity
: but u not C^infinity
: any example?
: Thanks
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