3088 varieties a solution to the Ackermann constant problem

Journal of Symbolic Logic 50 (2):487-501 (1985)
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Abstract

It is shown that there are exactly six normal DeMorgan monoids generated by the identity element alone. The free DeMorgan monoid with no generators but the identity is characterised and shown to have exactly three thousand and eighty-eight elements. This result solves the "Ackerman constant problem" of describing the structure of sentential constants in the logic R

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10.2307/2274237

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Citations of this work

Sentential constants in R and r⌝.Robert K. Meyer - 1986 - Studia Logica 45 (3):301 - 327.
A Pretabular Classical Relevance Logic.Lisa Galminas & John G. Mersch - 2012 - Studia Logica 100 (6):1211-1221.
Sentential constants in systems near R.John Slaney - 1993 - Studia Logica 52 (3):443 - 455.

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Entailment: The Logic of Relevance and Necessity.[author unknown] - 1975 - Studia Logica 54 (2):261-266.

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