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rbeezer committed 82ca57b

Sage CELT, needed symbolic variables (Tyler Ueltschi)

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 Typo:  Implication arrow in wrong direction, Theorem IMR (Dan Messenger)
 Typo:  Example LIC, second sentence, in/dependence (Aidan Meacham)
 Typo:  Solution B.T50, missing implication arrows
+Typo:  Sage CELT, needed symbolic variables (Tyler Ueltschi)
 
 MAJOR SOURCE FORMAT CHANGE
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File src/section-CB.xml

 <title>Designing Matrix Representations</title>
 How do we find the eigenvectors of a linear transformation?  How do we find pleasing (or computationally simple) matrix representations of linear transformations.  <acroref type="theorem" acro="EER" /> and <acroref type="theorem" acro="SCB" /> applied in the context of <acroref type="theorem" acro="DC" /> can answer both questions.  Here is an example.
 <sage>
-<input>outputs = [  9*x1 - 15*x2 - 7*x3 + 15*x4 - 36*x5 - 53*x6,
+<input>x1, x2, x3, x4, x5, x6 = var('x1, x2, x3, x4,x5,x6')
+outputs = [  9*x1 - 15*x2 - 7*x3 + 15*x4 - 36*x5 - 53*x6,
             24*x1 - 20*x2 - 9*x3 + 18*x4 - 24*x5 - 78*x6,
              8*x1 -  6*x2 - 3*x3 +  6*x4 -  6*x5 - 26*x6,
            -12*x1 -  9*x2 - 3*x3 + 13*x4 - 54*x5 - 24*x6,