The finite product of connected linearly ordered sets cannot be embedded into the product of a smaller dimension
Keywords:
linearly ordered topological spaces, product spaces, invariance of domainAbstract
We shall show that for every positive integers $n$ and $m$ with $m<n$, if $K_i$ is a connected linearly ordered topological space with at least two points for all $i<n$ and $L_j$ is a connected linearly ordered topological space for all $j<m$, there exists no continuous injective function from a nonempty open subset of $\prod_{i<n} K_i$ into $\prod_{j<m} L_j$.
References
L. E. J. Brouwer. über Abbildung von Mannigfaltigkeiten. Math. Ann., 71(1): 97-115, 1911.
T. Ishiu. Finite products of connected nowhere separable linearly ordered spaces. Topology Appl., 300:Paper No. 107763, 21, 2021.
T. Ishiu. The Mardešić conjecture for countably compact spaces. Topology Appl., 335:Paper No. 108596, 19, 2023.
T. Ishiu. Brouwer's fixed-point theorem on the finite product of compact linearly ordered topological spaces. Topology Appl., 362:Paper No. 109221, 14, 2025.
D. Kurepa. Ensembles ordonnés et ramifiés. Publ. Math. Univ. Belgrade, 4:1-138, 1935.
S. Mardešić. Mapping products of ordered compacta onto products of more factors. Glasnik Mat. Ser. III, 5(25):163-170, 1970.
S. Mardešić and P. Papić. Continuous images of ordered continua. Glasnik Mat.Fiz. Astronom. Društvo Mat. Fiz. Hrvatske Ser. II, 15:171-178, 1960.
G. Martínez-Cervantes and G. Plebanek. The Mardešić conjecture and free products of Boolean algebras. Proc. Amer. Math. Soc., 147(4):1763-1772, 2019.
L. B. Treybig. Concerning continuous images of compact ordered spaces. Proc. Amer. Math. Soc., 15:866-871, 1964.