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Remark on tolerance algebras. (English) Zbl 0478.08004


MSC:

08A30 Subalgebras, congruence relations
08B20 Free algebras
08B25 Products, amalgamated products, and other kinds of limits and colimits
08A05 Structure theory of algebraic structures
20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms)
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