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Aug 19, 2021 at 5:20 comment added Pietro Majer Yes, the final tautology was a kind of joke to suggest that in the above picture the explanation is completely obvious indeed.
Aug 18, 2021 at 20:00 comment added Richard Stanley "When you have taken all the stones from the board, there is no stone left on it" sounds like a tautology to me.
Aug 18, 2021 at 0:39 comment added Pietro Majer Thankyou Gerry :)
Aug 18, 2021 at 0:35 history edited Pietro Majer CC BY-SA 4.0
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Aug 17, 2021 at 23:47 comment added Gerry Myerson "rectangular triangle" meaning right-angled triangle, I presume.
Aug 17, 2021 at 16:01 history edited Pietro Majer CC BY-SA 4.0
added 30 characters in body
Aug 17, 2021 at 14:24 comment added Pietro Majer A somehow trivialising description
Aug 17, 2021 at 14:23 history answered Pietro Majer CC BY-SA 4.0