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Spring-free and 4+1-free interval orders are 2-count
Spring-free interval-order conjecture. Every spring-free, $\mathbf{4}+\mathbf{1}$ -free interval order is 2-count.
Conjectureopeninterval-orders order-representations posetsarXiv posted 2 days ago

Spring-free and 4+1-free interval orders are 2-count