Notes for BBS/Archibald-080709-110259.jpg
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Warning. The first term in the definition of [math]\displaystyle{ C }[/math], written on the blackboard as the identity matrix [math]\displaystyle{ I }[/math], should really be the diagonal matrix whose [math]\displaystyle{ jj }[/math] entry is [math]\displaystyle{ -s_jd_j }[/math].
