# Just one letter riddle

This riddle is composed with exactly one Greek letter:

$\color{green}\tau$

This letter describes an amazing and well known result. It is up to you to find out

Good Luck!

Hint:

Look at the second tag.

P.S this is my first riddle so feel free to suggest improvements/edits.

• Sorry to be critical but you literally just showed a green tau and the answer was "green tau". You even have a hint identifying it as a greek letter and pointed out the tag. Is this a puzzle? Isn't it just like showing a picture of a pink elephant and asking "what's this?" Yes a pink elephant, well done. – Astralbee Jun 29 '18 at 20:31
• @Astralbee Actually, the answer was the "green tao theorem". I agree I misjudged the difficulty of this puzzle though. – Yanko Jun 29 '18 at 20:51