Geodesic
New proofs of classical insertion theorems
Commentationes Mathematicae Universitatis Carolinae, Tome 41 (2000) no. 1, pp. 139-142.

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We provide new proofs for the classical insertion theorems of Dowker and Michael. The proofs are geometric in nature and highlight the connection with the preservation of normality in products. Both proofs follow directly from the Kat\v{e}tov-Tong insertion theorem and we also discuss a proof of this.
Classification : 54B10, 54C30, 54D15
Keywords: insertion of continuous functions; normality; countable paracompactness; perfect 
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     title = {New proofs of classical insertion theorems},
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Good, Chris; Stares, Ian. New proofs of classical insertion theorems. Commentationes Mathematicae Universitatis Carolinae, Tome 41 (2000) no. 1, pp. 139-142. http://geodesic.mathdoc.fr/item/CMUC_2000__41_1_a12/