subcover

American  

[suhb-kuhv-er] / ˈsʌbˌkʌv ər /

noun

Mathematics.

1. a set of subsets of a cover of a given set that also is a cover of the set.

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Etymology

Origin of subcover

sub- + cover

Example Sentences

The real definition of compactness is that a space is compact if every open cover of the space has a finite subcover.

From Scientific American

So the number line is not compact because we have found an open cover that does not have a finite subcover.

From Scientific American

That’s the point of the finite subcover in the definition of compactness.

From Scientific American

Proving noncompactness only requires producing one counterexample, while proving compactness requires showing that every single open cover of a space, no matter how oddly constructed, has a finite subcover.

From Scientific American

If you’ve taken a topology class before, you might have seen the definition of the topological property called compactness: a set is compact if every open cover of the set has a finite subcover. The topologist’s sine curve is not compact, but the closed topologist’s sine curve is.

From Scientific American