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Notation & Linear

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**Zhiya Lou**:

HI, I don't understand the notation from these question (sec1.3); And also about its linear/non-linear property... Thanks

22) $𝑢_{𝑥𝑥}+u_{𝑦𝑦}+𝑢𝑢_𝑥+𝑢𝑢_𝑦+u=0$

(why is it non linear?)

23) $u_{𝑥𝑥𝑥𝑥}+2u_{𝑥𝑥𝑦𝑦}+𝑢_{𝑦𝑦𝑦𝑦}=0$

**Kathryn Bucci**:

$u_x$ = partial derivative of $u$ with respect to $x$

$u_{xx}$ = second partial derivative of $u$ with respect to $x$

22) is not linear because of the two terms where u is multiplied by $u_x$ and $u_y$

I fixed math expressions for both of you. "Edit" to see how it should be done-V.I.

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