Young's inequality $\|h*f\|_{L^2}\le\|h\|_{L^2}\|f\|_{L^1}$ for the pointwise convolution integral on $\mathbb R^d$

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Young's inequality $\|h*f\|_{L^2}\le\|h\|_{L^2}\|f\|_{L^1}$ for the pointwise convolution integral on $\mathbb R^d$ · Prove2Me