Resolvable-derived-STS conjecture for SQS(n), n congruent to 4 modulo 6

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Let an SQS(n)(n) be a Steiner quadruple system on nn points, and let a derived STS be the Steiner triple system obtained by fixing a point of the SQS and deleting that point from every block containing it. A Steiner triple system is resolvable when its blocks can be partitioned into parallel classes.

Resolvable-derived-STS conjecture. If

n≡4 mod 6,n \equiv 4 \bmod 6,

then there is an SQS(n)(n) such that all its derived STS are resolvable.

This conjecture is used to obtain q0′(3,4,n)=n/2q'_0(3,4,n)=n/2. The source reports it as known for n=10n=10, for several families admitting 2-resolvable SQSs, and for sufficiently large nn with n≡4 mod 12n\equiv4\bmod12, but not in general.

References

Primary source

Minjia Shi, Yuhong Xia and Denis S. Krotov, “A family of diameter perfect constant-weight codes from Steiner systems”, arXiv:2212.00048 (2023).

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