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feferman_vaught_theorem (404B)

      1 # Feferman-Vaught theorem
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      3 https://en.wikipedia.org/wiki/Feferman%E2%80%93Vaught_theorem
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      5 [Theorem] in [model_theory]
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      7 Within a certain [logic], relates the [theory] (the [set] of [satisfied] [formulas]) of a [direct_product] of [structures] to the [theory] of the individual [structures]
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      9 A similar result exists for the [disjoint_union] of [structures]: [feferman_vaught_union]
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     11 Up: [theorem], [logic]