Cobordism

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

In mathematics, cobordism is a fundamental equivalence relation on the class of compact manifolds of the same dimension, set up using the concept of the boundary (French bord, giving cobordism) of a manifold.

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

Image: Nils R. Barth, Public domain, via Wikimedia Commons.