참고문헌
- Franz W., Topology I, Walter de Gruyter (1973).
- Querenburg B. V., Mengentheoretische Topologie, Springer Verlag (2001).
- Schubert H., Topology, Teubner (1975).
- Steen L. A. Seebach, JR. J. A., Counterexamples in topology, Springer Verlag (1995).
Korean Journal of Mathematics
- 제17권4호
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- Pages.411-417
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- 2009
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- 1976-8605(pISSN)
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- 2288-1433(eISSN)
THE IDEMPOTENT RELATION AND THE PROOF OF URYSOHN'S LEMMA
- Kim, Seungwook (Department of Mathematics Hankuk University of Foreign Studies)
- 투고 : 2008.09.22
- 발행 : 2009.12.30
초록
The Urysohn's lemma which is crucial tool for the study of the metrization problem is proved in the sense of set-theoretic concept, namely, by the idempotent relation defined on a given topology.