Geodesic
Positively closed classes of three-valued logic generated by one-place functions
Diskretnaya Matematika, Tome 21 (2009) no. 3, pp. 37-44.

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We consider the positive closure operator on the set $P_3$ of functions of three-valued logic. It is shown that in $P_3$ there are exactly 51 positively closed classes positively generated by one-place functions, 26 of these classes are generated by a single one-place function (including one of the positively precomplete in $P_3$ classes), and 25 classes are generated by two functions (including the class $P_3$ and the remaining 9 positively precomplete classes). 
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S. S. Marchenkov. Positively closed classes of three-valued logic generated by one-place functions. Diskretnaya Matematika, Tome 21 (2009) no. 3, pp. 37-44. http://geodesic.mathdoc.fr/item/DM_2009_21_3_a4/

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