A note on bf-spaces and on the distribution of the functor of the Dieudonné completion

Abstract

A subset B of a space X is said to be bounded (in X) if the restriction to B of every real-valued continuous function on X is bounded. A real-valued function on X is called bf-continuous if its restriction to each bounded subset of X has a continuous extension to the whole space X. bf-spaces are spaces such that bf-continuous functions are continuous. We take advantage to the exponential map in the realm of bf-spaces in order to study bf-extensions of bf-continuous functions. This allows us to improve several results concerning the distribution of the functor of the Dieudonné completion. We also prove that a relative version of the classical Glicksberg’s theorem characterizing the product of two pseudocompact spaces is valid for kr-spaces. In the last section we show that bf-hemibounded groups are Moscow spaces and, consequently, they are strong-PT-groups.

Keywords

• bf -space
• bf -continuous function
• exponential map
• dieudonné completion
• kr-space
• moscow space
• strong-pt-group
• 54c10
• 54c20
• 54c35
• 54c45
• 54d60
• 54g99
• 54h11