In deep thoughts in Pythagoras' home town, (Kroton), trying to decipher a mysterious engraving.

$a2+b2$ was clearly visible ... but profound knowledge of geometry indicated that something was missing.

The mystery could not be elucidated ...

... not even with the help of most modern technology (a Motorola cellular phone Model 8700 with 475 Megahertz and 8.3 Mega RAM, prize 540'000.- Lire).