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Free products and
elementary equivalence
Philip Olin |
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Vol. 52 (1974), No. 1, 175–184
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Abstract |
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It is shown that the free product operation on two groupoids preserves both elementary equivalence and elementary subsystem. An example is given showing the above results for semigroups false, thus answering in the negative a question of Feferman and Vaught. |
Mathematical Subject Classification
Primary: 02H13
Secondary: 20E30, 02H15
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Milestones
Received: 15 January 1973
Published: 1 May 1974
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Authors |
| Philip Olin | |
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