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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: College math
Topic ID: 708
Message ID: 1
#1, RE: Union of components in Riemann sphere is closed
Posted by alexb on Jan-31-09 at 10:06 AM
In response to message #0
The union R = P∩Q is a closed set. Would it help if we assumed Q to be connected? Then the union S of all components of P with points common with Q is a connected set. Is S a component of R?