Geodesic
Signal Metrics
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 28-39

Voir la notice de l'article provenant de la source Cambridge University Press

The purpose of this paper is to introduce a generalization of metric space that arises naturally out of the notion of signal function as it occurs, for example, in (5). In §§ 2-5, the basic definitions and motivation are given. In §§ 6 and 7 several elementary topological properties are proved, and in §§ 8 and 9 an important example from special relativity is developed. 
Darsow, William F. Signal Metrics. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 28-39. doi: 10.4153/CJM-1967-004-9
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