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travel groupoid; geodetic graph; infinite graph

References:

[1] Nebeský, L.: **An algebraic characterization of geodetic graphs**. Czech. Math. J. 48 (1998), 701-710. DOI 10.1023/A:1022435605919 | MR 1658245 | Zbl 0949.05022

[2] Nebeský, L.: **A tree as a finite nonempty set with a binary operation**. Math. Bohem. 125 (2000), 455-458. MR 1802293 | Zbl 0963.05032

[3] Nebeský, L.: **New proof of a characterization of geodetic graphs**. Czech. Math. J. 52 (2002), 33-39. DOI 10.1023/A:1021715219620 | MR 1885455 | Zbl 0995.05124

[4] Nebeský, L.: **On signpost systems and connected graphs**. Czech. Math. J. 55 (2005), 283-293. DOI 10.1007/s10587-005-0022-0 | MR 2137138 | Zbl 1081.05054

[5] Nebeský, L.: **Travel groupoids**. Czech. Math. J. 56 (2006), 659-675. DOI 10.1007/s10587-006-0046-0 | MR 2291765 | Zbl 1157.20336