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- W2138875100 abstract "Classifying (unordered) sets by the elementary (first order) properties of their automorphism groups was undertaken in (7), (9) and (11). For example, if Ω is a set whose automorphism group, S (Ω), satisfies then Ω has cardinality at most ℵ 0 and conversely (see (7)). We are interested in classifying homogeneous totally ordered sets (homogeneous chains, for short) by the elementary properties of their automorphism groups. (Note that we use ‘homogeneous’ here to mean that the automorphism group is transitive.) This study was begun in (4) and (5). For any set Ω, S (Ω) is primitive (i.e. has no congruences). However, the automorphism group of a homogeneous chain need not be o -primitive (i.e. it may have convex congruences). Fortunately, ‘ o -primitive’ is a property that can be captured by a first order sentence for automorphisms of homogeneous chains. Hence our general problem falls naturally into two parts. The first is to classify (first order) the homogeneous chains whose automorphism groups are o -primitive; the second is to determine how the o -primitive components are related for arbitrary homogeneous chains whose automorphism groups are elementarily equivalent." @default.
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- W2138875100 date "1981-01-01" @default.
- W2138875100 modified "2023-09-26" @default.
- W2138875100 title "Rigid homogeneous chains" @default.
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- W2138875100 doi "https://doi.org/10.1017/s0305004100057881" @default.
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