denumerable
adjective
- adjective (mathematics) Capable of being assigned a bijection to the natural numbers. Applied to sets which are not finite, but have a one-to-one mapping to the natural numbers. “The empty set is not denumerable because it is finite; the rational numbers are, surprisingly, denumerable because every possible fraction can be assigned a natural number and vice versa.”
Synonyms
Etymology
The word was introduced around the beginning of the 20th century, from Latin denumerō (“to count out”) + -able.
Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “denumerable”, CC BY-SA 4.0. Details