On the incompleteness of a descending chain of extensions of implicational s5

Mathematical Logic Quarterly 38 (1):321-323 (1992)
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Abstract

C5.ω is obtained by adding, schematically, to the strict-implicational fragment C5 of S5 the axiom → ) → . This paper presents a fully general proof that neither C5.ω nor any of a descending chain of its extensions is complete with respect to any class of frames, correcting the garbled details of a version skeched in an earlier paper , 201-208)

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For Want of an ‘And’: A Puzzle about Non-Conservative Extension.Lloyd Humberstone - 2005 - History and Philosophy of Logic 26 (3):229-266.

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