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arXiv 1604.06142math.FA
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混合$(\ell _{1},\ell _{2})$ -Littlewood不等式与插值

On the mixed $(\ell _{1},\ell _{2})$-Littlewood inequalities and interpolation

Mariana Maia, Joedson Santos

摘要:

众所周知,双线性Bohnenblust-Hille不等式(即,Littlewood的$4/3$不等式)通过对双线性混合$\left( \ell _{1},\ell_{2}\right) $ -Littlewood不等式进行插值得到.我们注意到,这不能扩展到$3$ -线性的情况下,在相反的方向,我们表明,$m$ -线性Bohnenblust-希勒不等式的常数的渐近增长是相同的混合$\left( \ell _{\frac{2m+2}{m+2}},\ell _{2}\right) $ -Littlewood不等式的常数。这意味着,相反,以前的作品似乎建议,插值不发挥至关重要的作用,在搜索的确切渐近增长的常数的Bohnenblust-希勒不等式。最后利用混合Littlewood型不等式得到了某些数列空间的最优余型常数。

英文摘要:

It is well-known that the optimal constant of the bilinear Bohnenblust--Hille inequality (i.e., Littlewood's $4/3$ inequality) is obtained by interpolating the bilinear mixed $\left( \ell _{1},\ell_{2}\right) $-Littlewood inequalities. We remark that this cannot be extended to the $3$-linear case and, in the opposite direction, we show that the asymptotic growth of the constants of the $m$-linear Bohnenblust--Hille inequality is the same of the constants of the mixed $\left( \ell _{\frac{2m+2}{m+2}},\ell _{2}\right) $-Littlewood inequality. This means that, contrary to what the previous works seem to suggest, interpolation does not play a crucial role in the search of the exact asymptotic growth of the constants of the Bohnenblust--Hille inequality. In the final section we use mixed Littlewood type inequalities to obtain the optimal cotype constants of certain sequence spaces.

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