1. CMB Online first
|Characters on $C( X)$|
The precise condition on a completely regular space $X$ for every character on $C(X) $ to be an evaluation at some point in $X$ is that $X$ be realcompact. Usually, this classical result is obtained relying heavily on involved (and even nonconstructive) extension arguments. This note provides a direct proof that is accessible to a large audience.
Keywords:characters, realcompact, evaluation, real-valued continuous functions