Preorder

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In mathematics, in particular in order theory, a preorder or quasiorder is a binary relation that is reflexive and transitive. The name preorder is meant to suggest that preorders are almost partial orders, but not quite, as they are not necessarily antisymmetric.

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

Image: Caleb Stanford, CC0, via Wikimedia Commons.