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generalized van Kampen-Siefert theorem for double groupoids

Defines: 
$\rho$-sequence,fundamental group, $\pi_1(X,x_0)$, topological invariant,non-commutative invariant, fundamental double groupoid, morphisms induced by inclusions
Synonym: 
DGvKST
Type of Math Object: 
Theorem
Major Section: 
Reference

Mathematics Subject Classification

57N20 no label found55Q15 no label found55N35 no label found

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