Geodesic
Natural deduction system for three-valued Heyting's logic
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2017), pp. 63-66

Voir la notice de l'article provenant de la source Math-Net.Ru

A Gentzen-style natural deduction system for the propositional fragment of three-valued Heyting's logic is presented in the paper. 
@article{VMUMM_2017_3_a9,
     author = {Ya. I. Petrukhin},
     title = {Natural deduction system for three-valued {Heyting's} logic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {63--66},
     publisher = {mathdoc},
     number = {3},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2017_3_a9/}
}
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Ya. I. Petrukhin. Natural deduction system for three-valued Heyting's logic. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2017), pp. 63-66. http://geodesic.mathdoc.fr/item/VMUMM_2017_3_a9/