Geodesic
Infinitely many maximal primitive positive clones in a~diagonalizable algebra
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2013), pp. 47-52.

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We present a rather simple example of infinitely many maximal primitive positive clones in a diagonalizable algebra, which serve as an algebraic model for the provability propositional logic $GL$. 
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Andrei Rusu. Infinitely many maximal primitive positive clones in a~diagonalizable algebra. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2013), pp. 47-52. http://geodesic.mathdoc.fr/item/BASM_2013_2_a5/

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