A countable poset with no infinite antichain is constructed that has no 'spine', disproving the Aharoni-Korman (fishbone) conjecture of 1992.
Inven- tiones mathematicae 176 , 1 (2009), 1–62
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The Aharoni--Korman conjecture is false
A countable poset with no infinite antichain is constructed that has no 'spine', disproving the Aharoni-Korman (fishbone) conjecture of 1992.