In the investment world, it’s common to discuss average rates of return. It’s not sufficient, however, to simply add up historical returns and divide by how many there are. The proper way to calculate ...

Let $f(z_1,\ldots,z_n)$ be an entire function of the $n(\geqq 2)$ complex variables $z_1,\ldots,z_n$ holomorphic for $|z_t| \leqq r_t, t = 1,\ldots n$. We have ...