Re: Preposterous change of variables


Igor wrote:
actionintegral@xxxxxxxxx wrote:


Cross product term? I'm not even sure what you are saying.


I'll try to be more precise - I have a space H(psi) and a time side
E(psi). The space side has a second order partial dervative in x. When
I make the substitution u=x-ct and v=x-ct and apply the chain rule I
get the cross product term d2(psi)/(du)(dv). This can be set to zero fi
the solution is a sum of travelling waves. But it also lets me separate
the variables as well leading to a solution.

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