Seifert–Van Kampen theorem

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What Wikipedia says

In mathematics, the Seifert–Van Kampen theorem of algebraic topology (named after Herbert Seifert and Egbert van Kampen), sometimes just called Van Kampen's theorem, expresses the structure of the fundamental group of a topological space

Excerpt from the Wikipedia article “Seifert–Van Kampen theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia