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Sheaf constructions and their elementary properties. (English) Zbl 0411.03022

##### MSC:
 03C30 Other model constructions 03C20 Ultraproducts and related constructions 03C60 Model-theoretic algebra 03C05 Equational classes, universal algebra in model theory 03C90 Nonclassical models (Boolean-valued, sheaf, etc.) 03B25 Decidability of theories and sets of sentences
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##### References:
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