[Humberstone, 2000]

[Wos and Spinks, 2005]


Based on

[Humberstone, 2000, p8]

(Different sources give different numberings of the axioms, all tracing back to Dr. Spinks' circulating but unpublished papers, some of which flip 8 and 9. Dr. Spinks, when contacted, stated that the Humberstone numbering is the prefered one. -JH)

Basis for

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