Definition:Cofinite Subset
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Definition
Let $S$ be a set.
Let $A$ be a subset of $S$.
$A$ is cofinite in $S$ if and only if the complement of $A$ in $S$ is finite.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): cofinite subset