A general Young inequality. Generalize Young's inequality given in Problem 15.14 and show that [left|f_{1} star f_{2}
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A general Young inequality. Generalize Young's inequality given in Problem 15.14 and show that
\[\left\|f_{1} \star f_{2} \star \cdots \star f_{N}ight\|_{r} \leqslant \prod_{j=1}^{N}\left\|f_{j}ight\|_{p}, \quad p=\frac{N r}{(N-1) r+1}\]
for all \(N \in \mathbb{N}, r \in[1, \infty)\) and \(f_{j} \in \mathcal{L}^{p}\left(\lambda^{n}ight)\).
Data from problem 15.14
Young's inequality. Adapt the proof of Theorem 15.6 and show that
\[
\|u \star w\|_{r} \leqslant\|u\|_{p} \cdot\|w\|_{q}
\]
for all \(p, q, r \in[1, \infty), u \in \mathcal{L}^{p}\left(\lambda^{n}ight), w \in \mathcal{L}^{q}\left(\lambda^{n}ight)\) and \(r^{-1}+1=p^{-1}+q^{-1}\).
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Data from problem 1514 For N 1 the inequality is trivial for N ...View the full answer
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