Subcover is Refinement of Cover/Corollary
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Corollary to Subcover is Refinement of Cover
Let $T = \struct {X, \tau}$ be a topological space.
Let $\UU$ be an open cover for $S$.
Let $\VV$ be a subcover of $\UU$.
Then $\VV$ is an open refinement of $\UU$.
Proof
As all the elements of $\UU$ are open, all the elements of $\VV$ are likewise open.
Hence the result from definition of open refinement.
$\blacksquare$