Can I express the product below as a summation?
$\prod_{i=1}^{30}\prod_{j=1}^{10}\lambda_{ij}^{y_{ij}}$
I am trying to use to rule $\prod_{i=1}^{N}\lambda^{\alpha_i}=\lambda^{\sum_{i=1}^N\alpha_i}$, however, I cannot figure out how it works when I have a double product.