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Illustrates and explains the Whitney-Graustein Theorem: two regular curves in the plane are regularly homotopic if and only if they have the same rotation number. From the "Topology" series.
International Film Bureau, Inc., 332 S. Michigan Ave., Chicago, IL 60604-4382, Phone: (312)427-4545, Fax: (312)427-4550
Available on VHS
Running time 19 minutes.
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