Survey 1979: Equational Logic - Department of Mathematics ...

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Goetz, A. and C. Ryll-Nardzewski, On basis of abstract algebras, Bull. Acad. Polon. Sci. Sr. Sci.
Math., Astronom, Phys., 8(1960), 147-161.
Gr/itzer, G., A theorem on doubly transitive permutation groups with applications to universal
algebras, Fund. Math., 53(1963), 25-41.
, Equational classes oœlattices, Duke Math. J., 33(1966), 613-622.
., Free algebras over first order axiom systems, Magyar Tud. Akad. Mat. Kutat6 Int. K6zl.,
8(1963), 193-199.
, Free S-structures, Trans. Amer. Math. Soc., 135(1969), 517-542.
., On polynomial algebras and free algebras, Canad. Math. J., 20(1968), 575.581.
., On the existence of free structures over universal classes, Math. Nachr., 36(1968),
135-140.
., Stone algebras form an equational class. Remarks on lattie. e theory, III, J. Austral. Math.
Soc., 9(1959), 308-309.
Gr//tzer, G., and H. Lakser, Equationally compact semilattices, Colloq. Math., 20(1969), 27-30.
., The structure of pseudo-complemented distributive lattices, II. Congruence extension and
amalgamation, Trans. Amer. Math. Soc., 156(1971), 343-358.
, Two observations on the congruence extension property, Proc. Amer. Math. Soc.,
35(1972), 63-64.
Gr/itzer, G., Lakser, H., and J. Pt'onka, Joins and direct products ofequationalclasses, Canad. Math.
Bull., 12(1969), 741-744.
Gumm, H. P., Malcev conditions in sums of varieties and a new Malcev condition, Algebra
Universalis, 5(1975), 56-64.
Hagemann, J. and A. Mitschke, On n-permutable congruences, Algebra Universalis, 3(1973), 8-12.
Halkowska, K., Congruences and automorphisms of algebras belonging to equational classes with
non-trivializing equalities, Bull. Soc. Roy. Sci. Liege, 44(1975), 8-11.
Hecht, T., and T. Katrihik, Equational classes of relative Stone algebras, Notre Dame J. Formal
Logic, 13(1972), 248-254.
Hedrlih, Z. and Lambek, J., How extensive is the category of semigroups? J. Algebra, 11(1969),
195-212.
Hedrlih, Z. and A. Pultr, On full embeddings of categories of algebras, Ill. J. Math., 10(1966),
392-406.
Hedrlih, Z. and Vopnka, P., An undecidability theorem concerning full embeddings into categories
oœalgebras, Comm. Math. Univ. Carolinae, 7(1966), 401-409.
Herrmann, C., Weak projective radius and finite equational bases for classes of lattices, Algebra
Universalis, 3(1973), 51-58.
Herrmann, C., and Andrea Hahn, Zum Wortproblem fiir freie Untermodulverbiinde, Arch. Math.,
(Basel), 26(1975), 449-453.
Herrmann, C., and Huhn, A., Zum Begriff der charakteristic modularer Verbgnde, Math. Z.,
144(1975), 185-194.
Herrmann, C. and Poguntke, W., The class of serblattices of normal subgroup lattices is not
elementary, Algebra Universalis, 4(1974), 280-286.
Higgs, D., Remarks on residually small varieties, Algebra Universalis, 1(1971), 383-385.
Hilton, P. J., Note on free and direct products in general categories, Bull. Soc. Math. Belg., 13(1961),
38-49.
Hong, D. X., Covering relations among lattice varieties, Pacific J. Math., 40(1972), 575-603.
Hu, T.-K., Characterization of algebraic functions in equational classes generated by independent
primal algebras, Algebra Universalis, 1(1971), 187-191.
.... On the bases of free algebras, Math. Scand., 16(1965), 25-28.