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Symmetric Matrices and Quadratic Forms
The Spectral Theorem, quadratic forms, and positive definite matrices.
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For
A
=
(
9
3
3
5
)
=
L
L
T
A=\begin{pmatrix}9&3\\3&5\end{pmatrix}=LL^T
A
=
(
9
3
3
5
)
=
L
L
T
,
find
ℓ
21
\ell_{21}
ℓ
21
.
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AC
7
8
9
+
4
5
6
−
1
2
3
×
0
.
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b
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