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Feitosa, Gracio, Nascimento, 2007) introduced a ne w logic, the TK Logic, that was presented initially in the Hilbert style. The objective of this work is to present the TK Logic in systems of natural deduction, seque nt calculus and tableaux as well as to show the equivalence between this new systems and the original one.

A LÓGICA TK EM DEDUÇÃO NATURAL, CÁLCULO DE SEQUENTES E TABLEAUX