Excisive triad explained

In topology, a branch of mathematics, an excisive triad is a triple

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

• Book: May, J. Peter . A concise course in algebraic topology . 2019 . 978-7-5192-6659-2 . 1200780491.
• Munkres, James

Topology, Prentice Hall; 2nd edition (December 28, 1999). .

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