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Mathematical Ambigram

Ambigrams are forms that look the same when rotated or flipped, like the image below:

One day, Trinity College, Cambridge, undergrad Adam P Goucher was wondering whether "it would be possible to write a true statement in first-order logic together with logical conjunctions and arithmetic operations, which also functions as an ambigram" when flipped upside down.

There are, of course, simple and trivial equations like 1 + 1 = 1 + 1, but Adam found non-trivial ones:

61 - (8 + 8 + 8 + 8 + 8) = (8 + 8 + 8 + 8 + 8) - 19

and

98 x 99 – (609 + 6969 + 111) = (111 + 6969 + 609) – 66 x 86

Super neat! Link - via The Guardian

Question is, is that a stupid or clever math trick? To which we have the answer: Why not both?


Clever/Stupid Ambigram T-Shirt

Heh, been waiting to use that reflective ambigram Clever/Stupid T-Shirt from the NeatoShop for a while!


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