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Mathematics
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Linear Models vs Nonlinear Models
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[QUOTE="DaveE, post: 6824531, member: 644223"] Yes. However, you will find examples of people that are either sloppy, or assuming other knowledge/contexts. For example, you might describe ##f(x) = x^2+x+3## as a linear combination of the basis set of functions {##x^n##}, but that's not the same as saying ##f(x)## is linear. You will often see people thinking lines are linear, as in the ##f(x)=mx+b## example, as I said before. So, that begs the question "Who is describing what?" BTW, I never understood why people list all three of those linearity requirements since two of them are a trivial derivation of superposition. [/QUOTE]
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