countably compact set
a set for which every cover consisting of a countable number of sets has a subcover consisting of a finite number of sets.
9 Common Grammatical PitfallsRead more in this article about some frequently asked questions and fun facts related to our definitions.
Fewer vs. LessMisuse of the terms fewer and less will set off alarms in the heads of many language enthusiasts. According to usage rules, fewer is only to be used when discussing countable things, while less is used for singular mass nouns. For example, you can have fewer ingredients, dollars, people, or puppies, but less salt, money, honesty, or love. If you can count it, go for …
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019