ument}$$h\leqslant 0$$\end{document}$. More precisely, the kernels of the effective potential satisfy the following bound (a similar statement is valid, of course, for the kernels of the effective source). Notation-wise, we let $\documentclass[12pt]{minimal}
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                \begin{document}$$W_n^{(h)}(\mathbf{x}_1,\ldots ,\mathbf{x}_n)$$\end{document}$ be the kernel of the effective potential $\documentclass[12pt]{minimal}
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                \begin{document}$${\mathcal {V}}^{(h)}(\Psi )$$\end{document}$ associated with the monomial in $\documentclass[12pt]{minimal}
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                \begin{document}$$\Psi $$\end{document}$ of order *n*; of course, $\documentclass[12pt]{minimal}
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                \begin{document}$$W^{(h)}_n$$\end{document}$ is non zero only if *n* is even. The arguments $\docu