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On countable isotypic structures
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math.LO
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isotypicstructurescountablegroupssetsanswersconceptconcerning
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We obtain several results concerning the concept of isotypic structures. Namely we prove that any field of finite transcendence degree over a prime subfield is defined by types; then we construct isotypic but not isomorphic structures with countable underlying sets: totally ordered sets, fields, and groups. This answers an old question by B. Plotkin for groups.
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