Geodesic
Normal subspaces in products of two ordinals
Fundamenta Mathematicae, Tome 151 (1996) no. 3, pp. 279-297.

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Let λ be an ordinal number. It is shown that normality, collectionwise normality and shrinking are equivalent for all subspaces of $(λ+1)^2$.
DOI : 10.4064/fm-151-3-279-297
Keywords: (collectionwise) normal, shrinking, product space

Nobuyuki Kemoto 1 ; Tsugunori Nogura 1 ; Kerry D. Smith 1 ; Yukinobu Yajima 1

1 
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Nobuyuki Kemoto; Tsugunori  Nogura; Kerry D. Smith; Yukinobu  Yajima. Normal subspaces in products of two ordinals. Fundamenta Mathematicae, Tome 151 (1996) no. 3, pp. 279-297. doi : 10.4064/fm-151-3-279-297. http://geodesic.mathdoc.fr/articles/10.4064/fm-151-3-279-297/

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