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 P: 1,270 I think I may be missing something...so whenever we write L= (...) + (...) + (...), is L necessarily always a LINEAR operator? Can non-linear operators be expressed this way? Also, there is something in general that I don't understand about operators...(I'm just guessing that I can do things like the following) If L=∂xy + cos(x) + (∂y)2, to find Lu, should we just imagine multiplying L with u (just like multiplying real numbers?), so Lu = [∂xy + cos(x) + (∂y)2] u =∂xy u + cos(x) u + (∂y)2 u (by distributive law of multiplication) ?