Jiang-type theorems for coincidences of maps into homogeneous spaces

Abstract

Let $f,g\colon X\to G/K$ be maps from a closed connected orientable
manifold $X$ to an orientable coset space $M=G/K$ where $G$ is
a compact connected Lie group, $K$ a closed subgroup and $\dim X=\dim M$.
In this paper, we show that if $L(f,g)=0$ then $N(f,g)=0$; if $L(f,g)\ne 0$
then $N(f,g)=R(f,g)$ where $L(f,g), N(f,g)$, and $R(f,g)$ denote the Lefschetz,
Nielsen, and Reidemeister coincidence numbers of $f$ and $g$, respectively.
When $\dim X> \dim M$, we give conditions under which $N(f,g)=0$ implies $f$
and $g$ are deformable to be coincidence free.