chensiyuan0510 发表于 2018-10-19 10:30
我少写了一个积分符号，应该是这样：

soojinfan 发表于 2018-10-21 04:09
I have a proof, but not sure it is correct or not, you can check with it.
First, you need to know  ...

chensiyuan0510 发表于 2018-10-21 15:06
I still don\'t know how you removed the integral symbol on x and dx.

soojinfan 发表于 2018-10-23 01:37
The arbitrary function phi(x) is chosen as an indicator function.

chensiyuan0510 发表于 2018-10-23 08:54
y(x) is a function of x, so is p(x,t). Setting phi(x) as an indicater function only replaced phi(x ...

zhongdian_sjtu 发表于 2018-10-18 21:34
不是很确定，仅供参考吧，如果对了就请采纳一下。谢谢

这段计算应该是参考本书的Appendix D. Calculus o ...