By Josep M. Font, Ramon Jansana

The aim of this monograph is to enhance a really basic method of the algebra ization of sententiallogics, to teach its effects on a few specific logics, and to narrate it to different latest techniques, specifically to these in keeping with logical matrices and the equational end result built through Blok, Czelakowski, Pigozzi and others. the most virtue of our approachlies within the mathematical gadgets used as types of a sententiallogic: We use summary logics, whereas the dassical techniques use logical matrices. utilizing versions with extra constitution permits us to mirror in them the metalogical houses of the sentential common sense. for the reason that an summary good judgment might be seen as a "bundle" or kin of matrices, one may possibly imagine that the recent types are basically reminiscent of the outdated ones; yet we think, after an total appreciation of the paintings performed during this region, that it's exactly the remedy of an summary good judgment as a unmarried item that provides upward thrust to an invaluable -and attractive- mathematical thought, in a position to clarify the connections, not just on the logical Ievel yet on the metalogical Ievel, among a sentential good judgment and the actual dass of versions we go along with it, specifically the dass of its complete versions. routinely logical matrices were considered as the main compatible proposal of version within the algebraic experiences of sentential logics; and certainly this concept offers sev eral completeness theorems and has generated a fascinating mathematical conception.

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Thus the congruence property is hard-wired inside strongly selfextensional logics, since by taking all filters on any algebra we always obtain it. It is clear that any strongly selfextensional logic is also selfextensional. O PEN PROBLEM . Is every selfextensional logic strongly selfextensional ? 19 This property is defined by requiring that all full models satisfy the congruence property, which defines selfextensionality for sentential logics. Accordingly, in later publications the more descriptive term fully selfextensional has been adopted, beginning with Definition 16 in Font [2003b].

L∗ , and as a consequence L∗ ∼ Therefore, the only possible bilogical morphisms between two reduced abstract logics are logical isomorphisms. 5 of Brown and Suszko [1973]. 15. Let L, L and L be abstract logics, let f be a logical morphism from L to L and let g be a bilogical morphism from L onto L such that ker g ⊆ ker f . Then there is a unique logical morphism h from L into L such that h ◦ g = f . Moreover, f projectively generates L from L if and only if h projectively generates L from L .

For any θ ∈ ConA, it holds that θ ∈ Con HA (θ). Moreover, ∼ ∼ it holds that HA (θ)/θ = A/θ, Fi S (A/θ) , that HA (θ) ∈ FMod S A and that ∼ the mapping θ → HA (θ) is order-preserving: If θ1 , θ2 ∈ ConA are such that ∼ ∼ θ1 ⊆ θ2 then HA (θ1 ) HA (θ2 ). 17 This problem was solved in the affirmative in Bou [2001] in the context of the study of certain subintuitionistic logics, and, independently, in Babyonyshev [2003] by an ad-hoc construcion. 3 T HE LATTICE OF FULL MODELS OVER AN ALGEBRA A/θ 41 A/θ P ROOF.