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单词 WeakestExtensionOfAPartialOrdering
释义

weakest extension of a partial ordering


Let A be a commutative ring with partial ordering A+ and suppose that B is a ring that admits a partial ordering.If f:AB is a ring monomorphism (thus we regard B as an over-ring of A),then any partial ordering of B that can contain f(A+) will also contain the set B+B defined by

B+:={i=1nf(ai)bi2:n,a1,,anA+}

B+ is itself a partial ordering and it is called theweakest partial ordering of B that extends A+ (through f). It is called ”weakest” because this is the smallest partial ordering B+ of B that will transform f into a poring monomorphismMathworldPlanetmathPlanetmathPlanetmathPlanetmathPlanetmathPlanetmath (i.e. a monomorphism in the categoryMathworldPlanetmath of partially ordered rings) f:(A,A+)(B,B+) (for simplicity, we abuse the symbol f here).

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更新时间:2025/5/4 9:20:39