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Mathematics of Projections
Another Route to the Same End
Matrix Multiplication
Look at upper left 3 x 3 part only of the transformation matrix.
Suppose its colums are v1, v2,
and v3.
Multiply by 
, 
, and 
The results are just v1, v2,
and v3.
So we say that the matrix 
takes the standard basis vectors to its three columns.
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Mathematics of Projections - 09 MAY 95
Page 32 of 44
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