论文标题
Borsuk-ulam定理，用于具有零几何形状的封闭3维流歧。
The Borsuk-Ulam theorem for closed 3-dimensional manifolds having Nil Geometry
论文作者
论文摘要
让M成为一个封闭的，连接的3个manifold，它可以接收NIL几何形状，我们确定M上的所有免费货币$τ$和$（m，τ）$的Borsuk-ulam索引。
Let M be a closed, connected 3-manifold which admits Nil geometry, we determine all free involutions $τ$ on M and the Borsuk-Ulam index of $(M,τ)$.
