$\|K*f\|_{L^2}\le B\|f\|_{L^2}$ on $L^2(\mathbb R^d)$ when $K\in L^2$ has $|\hat K|\le B$

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$\|K*f\|_{L^2}\le B\|f\|_{L^2}$ on $L^2(\mathbb R^d)$ when $K\in L^2$ has $|\hat K|\le B$ · Prove2Me