Cardinal number

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A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

In mathematics, a cardinal number, or cardinal for short, is a kind of number that measures the cardinality of a set, i.e., how many elements there are in a set. The cardinal number associated with a set ⁠

Excerpt from the Wikipedia article “Cardinal number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Schapel, Public domain, via Wikimedia Commons.