D. L. \ Gonçalves

The Borsuk-Ulam theorem for closed $3$-manifolds having geometry $S^2\times \R$

Let $M$ be a closed 3-manifold which admits the geometry $S^2\times \R$. In this work we determine all the free involutions $τ$ on $M$, and the Borsuk-Ulam index of $(M,τ)$.