Excisive triad

In topology, a branch of mathematics, an excisive triad is a triple $(X;A,B)$ of topological spaces such that A, B are subspaces of X and X is the union of the interior of A and the interior of B. Note B is not required to be a subspace of A.

See also

• Homotopy excision theorem

References

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• Munkres, James; Topology, Prentice Hall; 2nd edition (December 28, 1999). Template:ISBN.