Either-or topology
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In mathematics, the either-or topology is a topological structure defined on the closed interval [ − 1,1] by declaring a set open iff it either contains {0} or does not contain ( − 1,1).
[edit] References
- Lynn Arthur Steen and J. Arthur Seebach, Jr., Counterexamples in Topology. Springer-Verlag, New York, 1978. Reprinted by Dover Publications, New York, 1995. ISBN 0-486-68735-X (Dover edition).
