The Endomorphism Conjecture for Graded Posets of Width 4
Miklós Bóna, Ryan R. Martin·2022-05-31·via math.CO updates on arXiv.org
We prove the endomorphism conjecture for graded posets whose largest Whitney number is at most 4. In particular, this implies the endomorphism conjecture is true for graded posets of width at most 4.