Mayer–Vietoris sequence

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Science and technology

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What Wikipedia says

In algebraic topology and homology theory, the Mayer–Vietoris sequence is an algebraic tool to help compute algebraic invariants of topological spaces. The result is due to two Austrian mathematicians, Walther Mayer and Leopold Vietoris.

Excerpt from the Wikipedia article “Mayer–Vietoris sequence”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Quilbert, CC BY-SA 3.0, via Wikimedia Commons.