Abstract:Let $f:M\to M$ be a diffeomorphism on a compact connected smooth manifold of dimension at least $5$. It is known that the Nielsen number $N(f)$ of $f$ vanishes if and only if $f$ is isotopic to a fixed point free map. For any $n\ge 5$, there exists a compact $n$-dimensional nilmanifold $M$ such that {\it every} self homeomorphism on $M$ is isotopic to a fixed point free map. The proof depends on the fact that nilmanifolds are of {\it Jiang-type} and the fundamental group $\pi_1(M)$ has the property $R_{\infty}$ for certain nilmanifolds $M$. In this paper we construct the first known examples (an infinite family) of non-aspherical closed manifolds whose fundamental groups have property $R_{\infty}$ and that are also of Jiang-type. In particular, every self homeomorphism on such a manifold is isotopic to be fixed point free. The main objective of this work is to construct non-aspherical manifolds whose fundamental groups have property $R_{\infty}$ and that are also of Jiang-type.
From: Peter Wong [view email]
[v1]
Sun, 14 Jun 2026 22:13:39 UTC (19 KB)
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