Geodesic
Compactness and ordinals
Glasgow mathematical journal, Tome 13 (1972) no. 2, pp. 153-158

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

If p and q are cardinal numbers and E is a topological space, then the following property may or may not hold:Every cover of Eby fewer than q open sets has a subcover by fewer than pof them. (1)Clearly these properties, for various numbers p and q, are far from being independent; in this paper, we investigate some of the interrelationships between them. 
Knight, C. J. Compactness and ordinals. Glasgow mathematical journal, Tome 13 (1972) no. 2, pp. 153-158. doi: 10.1017/S0017089500001580
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