Lattice bimorphisms on f-algebras
Lattice bimorphisms on f-algebras
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f-代数上的格双态
DOI:
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发表时间:
2002
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通讯作者:
M. Toumi
中科院分区:
文献类型:
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作者:
K. Boulabiar;M. Toumi
Abstract. Let A, B and C be lattice-ordered algebras and let $ \Psi : A \times B \rightarrow C $ be a bilinear map. We call $ \Psi $ a lattice bimorphism if for each $ 0 \leq f \in A $ and each $ 0 \leq g \in B $ the partial maps $ g \mapsto \Psi (f, g) $ and $ f \mapsto \Psi (f, g) $ are lattice homomorphisms of B and A into C, respectively; and we say that $ \Psi $ is multiplicative if $ \Psi (uf, vg) = \Psi (u, v) \Psi (f, g) $ holds in C for all $ u, f \in A $ and $ v, g \in B $. In this paper, we study the connection between lattice bimorphisms and multiplicative bilinear maps on f-algebras in great detail. Our central result in this direction is the following: if A, B and C are Archimedean f-algebras with unit elements eA, eB and eC respectively and $ \Psi : A \times B \rightarrow C $ is a Markov bilinear map (i.e., $ \Psi $ is positive and $ \Psi $ (eA, eB) = eC) then $ \Psi $ is a lattice bimorphism if and only if $ \Psi $ is multiplicative. The main application of this result we present in this work is the Cauchy-Shwarz inequality in Archimedean (not necessarily commutative) d-algebras, which is an improvement of the result of Buskes and van Rooij, who established this inequality in the commutative case.