Can any one confirm that since the top is the derivative of the bottom? It is part of my bigger question for solving for u using method of characteristics
Danny and Prove it
Not sure I understand how you got the last term on the 2nd last line...? Can you clarify. FYI, my procedure is
dy/dx = -1, therefore y=-x+k, du/dx=u/(x+y) therefore .
Not sure what I have done wrong so far...
prove it, the above integration is based on assuming y is constant....not sure of this right