Excisive triad
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In topology, a branch of mathematics, an excisive triad is a triple [math]\displaystyle{ (X; A, B) }[/math] 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.[1] Note B is not required to be a subspace of A.
See also
Notes
References
- May, J. Peter (2019). A concise course in algebraic topology. ISBN 978-7-5192-6659-2. OCLC 1200780491.
- Munkres, James; Topology, Prentice Hall; 2nd edition (December 28, 1999). ISBN:0-13-181629-2.
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