"Nonlinear" doesn't mean "curved." It means "everything else left after you take out the linear". That's a huge inifinity of possibilities.
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Replying to @vgr
Showing my ignorance, sticking to 2D first, when you take away the things that are linear and the things that are curved, what's left?
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Replying to @ggibsonD35
piecewise linear things, affine things, random sets of points, self-intersecting jerky squiggles, non-smooth curves
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Replying to @vgr @ggibsonD35
for example, people don't realize that linearity implies f(0)=0. If it's a const and you can't move origin, linearity breaks.
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Replying to @vgr
OK - I'd have said that linear or not refers to functions and that in that domain, if d2/dx2 NE 0 was a definition.
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Replying to @ggibsonD35 @vgr
Jerky lines clearly meet the criteria as do irregular curves. I'll need to think about your dean of linearity.
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I'm going by linear algebra textbook definition: principle of superposition: f(ax+by)=af(x)+bf(y)
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