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Please help me.

  1. Nov 16, 2009 #1

    how can ı show the reflections over the line do not have group structure?

    --reflection of the real plane ------
  2. jcsd
  3. Nov 16, 2009 #2


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    Welcome to PF!

    Hi ktusurveyor! Welcome to PF! :smile:

    (please wait for replies, do not send out PMs)

    Hint: what are the conditions for a set to be a group?

    which of those conditions are not met by reflections?
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