Model theory

Reduced product

In model theory, a branch of mathematical logic, and in algebra, the reduced product is a construction that generalizes both direct product and ultraproduct. Let {Si | i ∈ I} be a family of structures of the same signature σ indexed by a set I, and let U be a filter on I. The domain of the reduced product is the quotient of the Cartesian product by a certain equivalence relation ~: two elements (ai) and (bi) of the Cartesian product are equivalent if If U only contains I as an element, the equivalence relation is trivial, and the reduced product is just the original Cartesian product. If U is an ultrafilter, the reduced product is an ultraproduct. Operations from σ are interpreted on the reduced product by applying the operation pointwise. Relations are interpreted by For example, if each structure is a vector space, then the reduced product is a vector space with addition defined as (a + b)i = ai + bi and multiplication by a scalar c as (ca)i = c ai. (Wikipedia).

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Related pages

Signature (logic) | Filter (mathematics) | Structure (mathematical logic) | Mathematical logic | Model theory | Vector space | Quotient set | Ultrafilter | Ultraproduct | Algebra | Direct product