Please is it true that if $f:K\to \mathbb{R}$ is a continuous function of a comact set $K\subset\mathbb{R}^m$ then $f$ can be extended to a continuous function of some open neighbourhood of $K$?
Please if it is true give me a reference to a book.
Post Closed as "Not suitable for this site" by Eric Wofsey, Andrés E. Caicedo, Ryan Budney, Stefan Waldmann, Willie Wong