- #1

Unskilled

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I used that if you have auxx+buxy+cuyy+dux+euy +fu+g=0

where a, b, c, d, e, f, g is constants,

and if b^2-4ac<0 then you get an elliptic type because

b=0, a=1, c=1 gives

0^2-4*1*1=-4<0 => elliptic

Is this right? And why do i have to do like this? i don't understand the meaning of type.