ULCFS and strong ULCFS conjectures for NTP2_2 and resilient formulas

Let φ(x,y)\varphi(x,y) be a partitioned formula. A formula is NTP2_2 when it does not have the tree property of the second kind, and it is resilient in the sense used in the paper. ULCFS and strong ULCFS conjecture. If φ(x,y)\varphi(x,y) is NTP2_2, or if the theory TT is NTP2_2, then φ(x,y)\varphi(x,y) satisfies ULCFS. If φ(x,y)\varphi(x,y) is resilient, or if TT is resilient, then φ(x,y)\varphi(x,y) satisfies strong ULCFS. The paper establishes related implications, including that strong ULCFS implies resilience and that ULCFS implies NTP2_2; the converses proposed here remain open.

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Primary source

Artem Chernikov and Chuyin Jiang, “Fractional Helly property and combinatorics of forking in NTP_2 theories”, arXiv:2605.18123 (2026).

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