〔定理级〕5 是在同一元素集上同时支撑两条互不可化约的有向哈密顿圈（步长 1 与步长 2）的最小整数，故五行之「五」由数论决定。——李旭彤《生之科学》（第十五章　旋机吸引子系统的形式化·命题六），问道研究所，2026。

李旭彤：〈SGC-0013〉5 是在同一元素集上同时支撑两条互不可化约的有向哈密顿圈（步长 1 与步长 2）的最小整数，故五行之「五」由数论决定〔定理级〕，载《生之科学》第十五章　旋机吸引子系统的形式化·命题六，问道研究所，2026。https://reresearch.org/claim/sgc-0013/

Li, Xutong (2026). SGC-0013 [Theorem]: 5 is the least integer admitting, on one element set, two mutually irreducible directed Hamiltonian cycles (steps 1 and 2); hence the "five" of the Five Phases is fixed by number theory. In: Science of Generation, 第十五章　旋机吸引子系统的形式化, 命题六. Reasoning Research Institute. https://reresearch.org/en/claim/sgc-0013/

@misc{SGC-0013,
  author = {Li, Xutong},
  title = {{SGC-0013}: 5 is the least integer admitting, on one element set, two mutually irreducible directed Hamiltonian cycles (steps 1 and 2); hence the "five" of the Five Phases is fixed by number theory.},
  howpublished = {Science of Generation Portal},
  organization = {Reasoning Research Institute},
  year = {2026},
  url = {https://reresearch.org/en/claim/sgc-0013/},
  note = {Epistemic tier: Theorem. Source: 第十五章　旋机吸引子系统的形式化, 命题六}
}