An old syllabus for MAT A22.

We find a linear system with solution set $\operatorname{Span}({ (1,0,2,3), (0,1,4,5)})$.
We check a simple lemma leading up to Bessel’s Inequality.








Diagonalizing the matrix: \[ \begin{bmatrix} 1 & 2\ 2 & 1 \end{bmatrix} \]

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