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arXiv · 2407.07741

Directed Transit Functions

Arun Anil·Manoj Changat·Lekshmi Kamal K-Sheela·Ameera Vaheeda Shanavas·John J. Chavara·Prasanth G. Narasimha-Shenoi·Bruno J. Schmidt·Peter F. Stadler
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Abstract

Transit functions were introduced as models of betweenness on undirected structures. Here we introduce directed transit function as the directed analogue on directed structures such as posets and directed graphs. We first show that betweenness in posets can be expressed by means of a simple set of first order axioms. Similar characterizations can be obtained for graphs with natural partial orders, in particular, forests, trees, and mangroves. Relaxing the acyclicity conditions leads to a generalization of the well-known geometric transit function to the directed structures. Moreover, we discuss some properties of the directed analogues of prominent transit functions, including the all-paths, induced paths, and shortest paths (or interval) transit functions. Finally we point out some open questions and directions for future work.

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Arun Anil, Manoj Changat, Lekshmi Kamal K-Sheela, Ameera Vaheeda Shanavas, John J. Chavara, Prasanth G. Narasimha-Shenoi, Bruno J. Schmidt, Peter F. Stadler. 2024-07-10. Directed Transit Functions. https://arxiv.org/abs/2407.07741

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