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Date: 17-4-2022
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Define an antipode of a given graph vertex as a vertex at greatest possible graph distance from . Then an antipodal graph is a connected graph in which each vertex has exactly one antipode (Gorovoy and Zmiaikou 2021).
The numbers of antipodal graphs on , 2, ... nodes are 1, 1, 0, 2, 1, 5, 8, 73, 660, 9909, ... (OEIS A349635).
Examples of antipodal graphs include Bruhat graphs, cocktail party graphs , even cycle graphs (Gorovoy and Zmiaikou 2021), hypercube graphs , and path graphs of odd length (Gorovoy and Zmiaikou 2021).
A tree is antipodal iff it has a unique longest path and this path is of odd length (Gorovoy and Zmiaikou 2021).
Every vertex of a geodetic Hamiltonian graph has at least two antipodes (Gorovoy and Zmiaikou 2021).
Gorovoy, D. and Zmiaikou, D. "On Graphs with Unique Geoodesics and Antipodes." 19 Nov 2021. https://arxiv.org/abs/2111.09987.
Sloane, N. J. A. Sequence A349635 in "The On-Line Encyclopedia of Integer Sequences."
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أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
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