[再寄小读者之数学篇](2014-10-08 乘积型 Sobolev 不等式)

$$ex ngeq 2, 1leq p<n a sen{f}_{L^frac{np}{n-p}(bR^n)} leq Cprod_{k=1}^n sen{p_k f}_{L^p(bR^n)}^frac{1}{n}. eex$$