Approximation by crystal-refinable function

Ursula Molter, Maria del Carmen Moure, Alejandro Quintero

Let $\Gamma$ be a crystal group in ${\mathbb{R}}^d$. A function $\phi :{\mathbb{R}}^d⟶\mathbb{C}$ is said to be {\em crystal-refinable} (or $\Gamma -$refinable) if it is a linear combinat…