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Linear Algebra/Projection
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Linear Algebra Projection Changing Map Representations Orthogonal Projection Onto a Line
This section is optional; only the last two sections of Chapter Five require this material.
We have described the projection from into its
plane subspace as a "shadow map".
This shows why, but it also shows that some shadows fall upward.
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So perhaps a better description is: the projection of
is the in the plane with the property that
someone standing on and looking straight up or down sees
.
In this section we will generalize this to other projections,
both orthogonal (i.e., "straight up and down") and nonorthogonal.
Linear Algebra Projection Changing Map Representations Orthogonal Projection Onto a Line