Please anyone tell me, how
 

Please anyone tell me, how

dp/dt+du/dx+dv/dt=0;
du/dt+dp/dx=0;
dv/dt+dp/dy=0;
...will be soLved, bywhich scheme???....this eqution is wave eqution in 2 D...Utt=(C
^2*(Uxx+Uyy).can you plses tell me anyone have solved it earlier?