Tuesday, June 30, 2009

A Mathematician Goes on Vacation 4

I saw this symbol on a lot of walls. It is the Serbian Cross. I'm told the meaning is basically equivalent to our motto "United We Stand, Divided We Fall" (although the Wikipedia article says that this interpretation is a common misconception). I was impressed by the interesting symmetry: two lines of reflection and rotational symmetry.

pic by alexmac1

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