Combination Theorem for Continuous Mappings/Topological Division Ring/Negation Rule

From ProofWiki
Jump to navigation Jump to search


Let $\struct{S, \tau_{_S}}$ be a topological space.

Let $\struct{R, +, *, \tau_{_R}}$ be a topological division ring.

Let $g : \struct{S, \tau_{_S}} \to \struct{R, \tau_{_R}}$ be a continuous mapping.

Let $- g : S \to R$ be the mapping defined by:

$\forall x \in S: \map {\paren{- g}} x = - \map g x$


$- g : \struct{S, \tau_{_S}} \to \struct{R, \tau_{_R}}$ is continuous.


By definition of a topological division ring, $\struct{R, +, *, \tau_{_R}}$ is a topological ring.

From Negation Rule for Continuous Mappings to Topological Ring, $- g : \struct{S, \tau_{_S}} \to \struct{R, \tau_{_R}}$ is a continuous mapping.


Also see