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Three sequences of formulas with two variables in the positive propositional logic
Izvestiya. Mathematics, Tome 2 (1968) no. 4, pp. 845-848 Cet article a éte moissonné depuis la source Math-Net.Ru

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Some questions of the positive calculus are considered. 
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V. A. Yankov. Three sequences of formulas with two variables in the positive propositional logic. Izvestiya. Mathematics, Tome 2 (1968) no. 4, pp. 845-848. http://geodesic.mathdoc.fr/item/IM2_1968_2_4_a9/

[1] Rasiowa H., Sikorski R., The mathematics of metamathematics, Warszawa, 1963

[2] Nishimura I., “On formulas of one variable in intuitionistic propositional calculus”, J. Simbolic logic, 25:4 (1960), 327–331 | DOI | MR | Zbl

[3] Yankov V. A., “O nekotorykh superkonstruktivnykh ischisleniyakh vyskazyvanii”, Dokl. AN SSSR, 151:4 (1963), 795–796