scientific article; zbMATH DE number 3377534
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Publication:5648571
zbMath0238.20078MaRDI QIDQ5648571
Publication date: 1972
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Free semigroups, generators and relations, word problems (20M05) Groupoids (i.e. small categories in which all morphisms are isomorphisms) (20L05)
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HNN extensions of semigroups ⋮ The class of embeddable semigroup amalgams is not finitely axiomatizable ⋮ The embedding of semigroup amalgams ⋮ Free products with amalgamation of semigroups ⋮ Deciding embeddability of partial groupoids into semigroups
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