Equation 7.12.5E7114DA296F9

\begin{equation} \prod _{i=1}^ n\left(\frac{\alpha _{i,l}(Q)}{|Q|}\right)^{1/n} \geq \frac1{|Q|}\int _{Q\cap K_ l}\prod _{i=1}^ nf_ i^{1/n}\, \mathrm d\mu =\frac{\lambda _ l(Q)}{|Q|}. \end{equation}