Does the endomorphism poset $P^P$ determine whether a finite poset $P$ is connected? An issue Duffus raised in 1978
Duffus wrote in his 1978 Ph.D. thesis, "It is not obvious that $P$ is connected and $P^P\cong Q^Q$ imply that $Q$ is connected", where $P$ and $Q$ are finite nonempty posets. We show that, indeed, under these hypotheses $Q$ is connected and $P\cong Q$.
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| Автор: | |
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| Формат: | Artigo |
| Мова: | Inglês |
| Опубліковано: |
Institute of Mathematics of the Czech Academy of Science
2023-12-01
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| Серія: | Mathematica Bohemica |
| Предмети: | |
| Онлайн доступ: | http://mb.math.cas.cz/full/148/4/mb148_4_1.pdf |
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