classified the partial differential equations (-1,1) ,2xy(d²z/dxdy)-(x²+y)(d²z/dy²)-(x+y)=0
Mathbot Says...
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classified the partial differential equations (-1,1) ,2xy(d²z/dxdy)-(x²+y)(d²z/dy²)-(x+y)=0
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.