L2 norm and spectral radius for

$$A=A^T$$

L2 inducded norm:

### NOTE: L2 norm is not the same as Frobenius norm. L2 norm is an “induced vector” norm, Frobenius is a “matrix” norm.¶

Induced norm:

$$$|| . ||$$

defined as ||A|| =

$$sup_{||x=1||} ||Ax||$$

Note how ||Ax|| is a vector norm too, while ||A|| is a matrix norm

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