1.1.5 Linear operators, linear PDEs

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I love the explanation below since this tells why the differential equation is "Linear"
L(u+v)=L(u)+L(v) and L(c*u) = c*L(u)
Anyway, nice video!

Panicsonic-E
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Thanks so much! This certainly helped, however I missed the point of why the second one (from top) is non-linear.

valeriereid