How to prove the radial basis function $k(u,v) = \int_{\mathbb{R}^d} \phi_t(u)\phi_t(v)dt $ can be integrated out by mapping function? $$\phi_{t}(u) = \frac{1}{(2\pi\Sigma)^{d/2}} \exp\left\{-\frac{\|u - t\|^2}{2\Sigma}\right\}$$ In other words, the integration will produce the radial basis function $$k(u,v) = \alpha \exp\left\{-\frac{\|u - v\|^2}{\beta}\right\}$$

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