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April 23, 2014

April 23, 2014

Posted by **julie** on Sunday, December 7, 2008 at 11:03am.

- math -
**drwls**, Sunday, December 7, 2008 at 11:19amA reflection about both the x and y axes will move a point to the opposite side of the origin (180 degrees away), and the same distance away from it.

Hence there is symmetry of a set about the origin, if there is symmetry about the x and y axis.

This is probably no a "proof" in words that set theorists would prefer.

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