$L^2$ estimate $\|K*f\|_2\le B\|f\|_2+2\|K-K'\|_2\|f\|_1$ for $f\in L^1\cap L^2$ and compactly supported continuous $K'$

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$L^2$ estimate $\|K*f\|_2\le B\|f\|_2+2\|K-K'\|_2\|f\|_1$ for $f\in L^1\cap L^2$ and compactly supported continuous $K'$ · Prove2Me