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At Most Countable
publish date: 2026/05/23 21:45:37.480694 UTC
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A set is said to be at most countable if it is:
Correct Answer
Finite or countably infinite
Explanation
A set is at most countable if it is either finite or countably infinite. This term bundles both cases together and is equivalent to saying the set is equivalent to a subset of \(\mathbb{N}\). An uncountable set is necessarily infinite but more than countably infinite — its cardinality exceeds \(\aleph_0\).
Reference
Introduction to Differential Calculus (Systematic Studies with Engineering Applications for Beginners) - 2012