Some remarks on degree theory for ${\text{\rm SO}(2)}$-equivariant transversal maps

Abstract

The aim of this article is to introduce a new class $\text{\rm SO}(2)$-equivariant
transversal maps $\text{\rm cl}(\Omega),\partial \Omega)$ and to define
degree theory for such maps. We define degree for $\text{\rm SO}(2)$-equivariant transversal maps and prove some properties
of this invariant. Moreover, we characterize $\text{\rm SO}(2)$-equivariant transversal isomorphisms and derive formula
for degree of such isomorphisms.