arXiv:2611.10624 · v1

A Simple Computer-Assisted Proof of the 5/6-Bound for Real-Period Pinwheel Scheduling

首次提交 2026-11-07 18:02

版本更新 2026-11-07 18:02

雷达观测 2026-11-10 11:14

摘要

In pinwheel scheduling with real periods, an instance consists of $n$ tasks with real periods $1\le a_1\le a_2\le\cdots\le a_n$. The goal is to find a schedule that assigns one task to each day indefinitely such that, for every task $i\in\{1,\dots,n\}$ and every positive integer $\ell$, task $i$ occurs at least $\ell$ times in every block of $\lceil\ell a_i\rceil$ consecutive days. Given an instance $(a_1,a_2,\dots,a_n)$, its dimension is $n$, its density is $\sum_{i=1}^n1/a_i$, and its potential is $\sum_{i=1}^{n-1}1/a_i$. We prove that every real-valued instance of density at most 5/6 admits a periodic schedule of period length less than $4\cdot2^n$. For integer periods, the 5/6 density bound was a long-standing conjecture settled by Kawamura using a computer-assisted proof [STOC 2024, PNAS 2026]. Our result confirms the real-period conjecture of Fujiwara, Miyagi, and Ouchi [DMTCS 2026]. Our computer-assisted proof builds on Kawamura's ideas while using fewer explicit schedules. It combines dimension reduction by folding with nine satisfiability modulo theories (SMT) checks over linear real arithmetic. A set of 14287 explicit periodic schedules contains a schedule for every instance of dimension at most 8 and density at most 5/6, and for every instance of dimension 9 and potential at most 5/6. Folding is used to reduce every instance of larger dimension and potential at most 5/6 to an instance of dimension 9 and the same potential bound. We also prove that every real-valued instance with minimum period at least 4 and density at most 17/20=0.85 admits a periodic schedule of period length less than $19\cdot2^n$. The density bound 17/20 is tight and improves the 0.84-bound of Mishra, Rho, and Kleinberg [arXiv 2025] for integer periods. It also resolves the $a_1=4$ case of Kawamura's 2025 conjecture that integer-valued instances of density at most $1-(a_1-1)/(a_1(a_1+1))$ are schedulable.