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math.LO2013★ 1 cited
Free algebras in varieties of Hilbert algebras with supremum generated by finite chains
Aldo V. Figallo, Elda Pick, Susana Saad +1
Hilbert algebras with supremum, i.e., Hilbert algebras where the associated order is a join-semilattice were first considered by A.V. Figallo, G. Ramon and S. Saad in [11], and ind…
math.LO2013★ 2 cited
Several characterizations of the 4--valued modal algebras
Aldo V. Figallo, Paolo Landini
A. Monteiro, in 1978, defined the algebras he named tetravalent modal algebras, will be called 4--valued modal algebras in this work. These algebras constitute a generalization of…