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                    Mathematica-Compatible Notebook

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Density Plots are rectangular arrays with color or gray depending \
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ContourPlot is like an overhead view of a lanscape made of \
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\>", "Section"],

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Then there's the Plot3D perspective, using the same color \
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\>", "Section"],

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Cell["\<\
First we look at points at height z = f(x, y) above (x, y, 0).\
\>",
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Cell["\<\
Now let's see the curves traced on the surface by each horizontal \
line y = y1\
\>", "Section"],

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Cell["See one curve...", "Subsection"],

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Cell["... or see them all!", "Subsection"],

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Cell["\<\
Now for something more solidly built: we see trace curves 
from intersecting various planes with the surface:\
\>", "Section"],

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Cell["Here's a vertical plane  x = a  slicing the surface.", "Section",
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I want to see the trace curve where the plane slices through!\
\>", 
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Cell["We can list the output values in numerical (table) form", "Section"],

Cell[BoxData[
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We 'll want to look at the contour plot the density plot and the 3D \
plot all at once!
(The numerical table is thrown in at no extra charge.)\
\>", "Section"],

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Cell["Tell me this isn't art!  (adapted from the MMA Help section)", "Section"],

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End of Mathematica Notebook file.
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