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September 21, 2014

September 21, 2014

Posted by **Mark** on Thursday, April 22, 2010 at 8:45am.

- math -
**bobpursley**, Thursday, April 22, 2010 at 8:48am - math -
**Reiny**, Thursday, April 22, 2010 at 9:03amWhen you study the link given by bobpursely, make a note of

Albrecht Dürer's magic square, probably the most famous 4by4 magic square.

I especially like how, in the last row, he was able to insert the date of his "Melancolia" engraving as

1 15 14 4 to stand for 1514 AD

A being the first letter of the alphabet and D being the 4th letter, with 1514 the year

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