Geodesic
Sum Theorems for Countably Paracompact Spaces
Canadian journal of mathematics, Tome 25 (1973) no. 4, pp. 706-711

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

In this paper, we extend the class of spaces to which the Σ and β theorems of Hodel apply, as well as the sum and subset theorems of [2]. Instead of the open cover definition of countable paracompactness, we utilize an equivalent formulation of countable paracompactness, due to Ishikawa [3]. 
Potoczny, Henry. Sum Theorems for Countably Paracompact Spaces. Canadian journal of mathematics, Tome 25 (1973) no. 4, pp. 706-711. doi: 10.4153/CJM-1973-072-5
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