
doi: 10.1007/bf01195725
For an algebraic system \(A\) and a quasivariety \(\mathcal K\) let \(\text{Con}_{{\mathcal K}} A\) be the lattice of all congruence relations \(\theta\) on \(A\) such that \(A/\theta\in {\mathcal K}\). Define the embedding relation \(\leq\) as follows: \(\theta\leq \theta'\) iff \(A/\theta'\) is embeddable into \(A/\theta\). Let \(\text{Sp}(\text{Con}_{{\mathcal K}} A, \leq)\) be the lattice of algebraic \(\leq\)-closed subsets of \(\text{Con}_{{\mathcal K}} A\). The author proves that every lattice \(L_ q({\mathcal K})\) of subquasivarieties of \(\mathcal K\) is isomorphic to the inverse limit of lattices \(\text{Sp}(\text{Con}_{{\mathcal K}} G_ i, \leq)\) for some set of finitely presented systems \(G_ i\) of the quasivariety \(\mathcal K\). In particular, the lattice \(L_ q({\mathcal K})\) is residually finite for every locally finite quasivariety \(\mathcal K\) of finite type. Also some new properties of embedding relations on congruence lattices of free systems are investigated.
subquasivariety lattices, congruence lattices free systems, quasivariety, Lattices of varieties, free systems, embedding relation, inverse limit, Quasivarieties
subquasivariety lattices, congruence lattices free systems, quasivariety, Lattices of varieties, free systems, embedding relation, inverse limit, Quasivarieties
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