E. Marczewski. Sur les congruences et les propriétés positives d'algèbres abstraites. Colloquium mathematicum, vol. 2 no. 3–4 (for 1951, pub. 1952), pp. 220–228. - Roger C. Lyndon. Properties preserved under homomorphism. Pacific journal of mathematics, vol. 9 (1959), pp. 143–154. - Roger C. Lyndon. Properties preserved in subdirect products. Pacific journal of mathematics, vol. 9 (1959), pp. 155–164. - R. C. Lyndon. Sentences preserved under homomorphisms; sentences preserved under subdirect products. Summaries of talks presented at the Summer Institute for Symbolic Logic, Cornell University, 1957, 2nd edn., Communications Research Division, Institute for Defense Analyses, Princeton, N.J., 1960, pp. 122–124. - R. C. Lyndon. Properties preserved under algebraic constructions. Bulletin of the American Mathematical Society, vol. 65 (1959), pp. 287–299.

Thomas Frayne

doi:10.2307/2270217

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E. Marczewski. Sur les congruences et les propriétés positives d'algèbres abstraites. Colloquium mathematicum, vol. 2 no. 3–4 (for 1951, pub. 1952), pp. 220–228. - Roger C. Lyndon. Properties preserved under homomorphism. Pacific journal of mathematics, vol. 9 (1959), pp. 143–154. - Roger C. Lyndon. Properties preserved in subdirect products. Pacific journal of mathematics, vol. 9 (1959), pp. 155–164. - R. C. Lyndon. Sentences preserved under homomorphisms; sentences preserved under subdirect products. Summaries of talks presented at the Summer Institute for Symbolic Logic, Cornell University, 1957, 2nd edn., Communications Research Division, Institute for Defense Analyses, Princeton, N.J., 1960, pp. 122–124. - R. C. Lyndon. Properties preserved under algebraic constructions. Bulletin of the American Mathematical Society, vol. 65 (1959), pp. 287–299.

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E. Marczewski. Sur les congruences et les propriétés positives d'algèbres abstraites. Colloquium mathematicum, vol. 2 no. 3–4 (for 1951, pub. 1952), pp. 220–228. - Roger C. Lyndon. Properties preserved under homomorphism. Pacific journal of mathematics, vol. 9 (1959), pp. 143–154. - Roger C. Lyndon. Properties preserved in subdirect products. Pacific journal of mathematics, vol. 9 (1959), pp. 155–164. - R. C. Lyndon. Sentences preserved under homomorphisms; sentences preserved under subdirect products. Summaries of talks presented at the Summer Institute for Symbolic Logic, Cornell University, 1957, 2nd edn., Communications Research Division, Institute for Defense Analyses, Princeton, N.J., 1960, pp. 122–124. - R. C. Lyndon. Properties preserved under algebraic constructions. Bulletin of the American Mathematical Society, vol. 65 (1959), pp. 287–299.

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E. Marczewski. Sur les congruences et les propriétés positives d'algèbres abstraites. Colloquium mathematicum, vol. 2 no. 3–4 (for 1951, pub. 1952), pp. 220–228. - Roger C. Lyndon. Properties preserved under homomorphism. Pacific journal of mathematics, vol. 9 (1959), pp. 143–154. - Roger C. Lyndon. Properties preserved in subdirect products. Pacific journal of mathematics, vol. 9 (1959), pp. 155–164. - R. C. Lyndon. Sentences preserved under homomorphisms; sentences preserved under subdirect products. Summaries of talks presented at the Summer Institute for Symbolic Logic, Cornell University, 1957, 2nd edn., Communications Research Division, Institute for Defense Analyses, Princeton, N.J., 1960, pp. 122–124. - R. C. Lyndon. Properties preserved under algebraic constructions. Bulletin of the American Mathematical Society, vol. 65 (1959), pp. 287–299.

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