Slice regular functions on alternative *-algebras : prescribing zeroes and values on discrete sets and related extension problems

Slice regular functions are a generalization of holomorphic functions where alternative real $\ast$-algebras are considered instead of the field of complex numbers. For such functions we show that zero sets and function values on suitable subsets may be prescribed. As a consequence, we show that for any axially symmetric domain there exist slice regular functions which (due to the nature of its zero set) can not be extended to a larger such domain.