TY - JOUR
T1 - Invariant version of cardinality quantifiers in superstable theories
AU - Berenstein, Alexander
AU - Shami, Ziv
PY - 2006
Y1 - 2006
N2 - We generalize Shelah's analysis of cardinality quantifiers from Chapter V of Classification Theory and the Number of Nonisomorphic Models for a superstable theory. We start with a set of bounds for the cardinality of each formula in some general invariant family of formulas in a superstable theory (in Classification Theory, a uniform family of formulas is considered) and find a set of derived bounds for all formulas. The set of derived bounds is sharp: up to a technical restriction every model that satisfies the original bounds has a sufficiently saturated elementary extension that satisfies the original bounds and such that for each formula the set of its realizations in the extension has arbitrarily large cardinality below the corresponding derived bound of the formula.
AB - We generalize Shelah's analysis of cardinality quantifiers from Chapter V of Classification Theory and the Number of Nonisomorphic Models for a superstable theory. We start with a set of bounds for the cardinality of each formula in some general invariant family of formulas in a superstable theory (in Classification Theory, a uniform family of formulas is considered) and find a set of derived bounds for all formulas. The set of derived bounds is sharp: up to a technical restriction every model that satisfies the original bounds has a sufficiently saturated elementary extension that satisfies the original bounds and such that for each formula the set of its realizations in the extension has arbitrarily large cardinality below the corresponding derived bound of the formula.
KW - Cardinality quantifiers
KW - Superstable theories
UR - http://www.scopus.com/inward/record.url?scp=79961097623&partnerID=8YFLogxK
U2 - 10.1305/ndjfl/1163775441
DO - 10.1305/ndjfl/1163775441
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AN - SCOPUS:79961097623
SN - 0029-4527
VL - 47
SP - 343
EP - 351
JO - Notre Dame Journal of Formal Logic
JF - Notre Dame Journal of Formal Logic
IS - 3
ER -