Young's inequality $\||h|*|f|\|_2\le\|h\|_2\|f\|_1$ on $\mathbb R^d$ (squared lower-integral form)

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Young's inequality $\||h|*|f|\|_2\le\|h\|_2\|f\|_1$ on $\mathbb R^d$ (squared lower-integral form) · Prove2Me