$\displaystyle u_{x}u_{xx}+xuu_{y}=sin(y)$ in the book is classified as quasi linear

also,

$\displaystyle u_{x^2}+uu_{y}=1$ is classified as non-linear.

So why would the first one be quasi instead of non-linear?

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- Feb 19th 2013, 07:16 AMHal2001Partial Differential Classification
$\displaystyle u_{x}u_{xx}+xuu_{y}=sin(y)$ in the book is classified as quasi linear

also,

$\displaystyle u_{x^2}+uu_{y}=1$ is classified as non-linear.

So why would the first one be quasi instead of non-linear?