Commensurability

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Notion

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Science and technology

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What Wikipedia says

In mathematics, two non-zero real numbers a and b are said to be commensurable if their ratio ⁠a/b⁠ is a rational number; otherwise a and b are called incommensurable. (Recall that a rational number is one that is equivalent to the ratio of two integers.) There is a more general notion of commensurability in group theory.

Excerpt from the Wikipedia article “Commensurability (mathematics)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia