This riddle is composed with exactly one Greek letter:


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

Good Luck!


Look at the second tag.

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

  • 1
    $\begingroup$ 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. $\endgroup$
    – Astralbee
    Jun 29, 2018 at 20:31
  • 1
    $\begingroup$ @Astralbee Actually, the answer was the "green tao theorem". I agree I misjudged the difficulty of this puzzle though. $\endgroup$
    – Yanko
    Jun 29, 2018 at 20:51

1 Answer 1


The green tau refers to the Green-Tao theorem.

  • $\begingroup$ I hope that wasn't too easy. Any way, Good job! $\endgroup$
    – Yanko
    Jun 28, 2018 at 23:40

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