bn:03099791n
Noun Named Entity
EL
seifert-van kampen θεώρημα  θεώρημα van kampen
EN
In mathematics, the Seifert–van Kampen theorem of algebraic topology, sometimes just called van Kampen's theorem, expresses the structure of the fundamental group of a topological space X {\displaystyle X} in terms of the fundamental groups of two open, path-connected subspaces that cover X {\displaystyle X}. Wikipedia
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