This is not a school problem. I just learning PDE on my own. The problem is:
Transform in to
I gave this a lot of thoughts. I still cannot accept
Please bear with me. Let's take a look at this example:
Yes I know I am playing around and the argument is very thin, but never the less, it is valid. My whole point is just because and are independent variable, not necessary equal 0.
do not imply at all
I don't think the question is good to say I have been struggling on this very point for two days!!!!
Please tell me if I am correct.
Thanks a million.