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Positive-semidefinite kernel

Reproducing-kernel Hilbert space

{title2=$\Sigma$}

For feature vectors $\phi(x_i)$, the empirical uncentered kernel covariance operator is
$$
\Sigma v=\frac1n\sum_i\phi(x_i)\langle\phi(x_i),v\rangle.
$$


Kernel covariance operator

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 218 / 4 / c / Solution

Kernel covariance operator ( $Σ$ )

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Kernel covariance operator (Σ)

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Kernel covariance operator ( $Σ$ )

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