3088 varieties a solution to the Ackermann constant problem

Journal of Symbolic Logic 50 (2):487-501 (1985)
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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DOI 10.2307/2274237
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Sentential Constants in R and R⌝.Robert K. Meyer - 1986 - Studia Logica 45 (3):301 - 327.
Sentential Constants in Systems Near R.John Slaney - 1993 - Studia Logica 52 (3):443 - 455.

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