Abstract: First, we establish a useful characterization of effective sets in conditionally complete partially ordered sets. Then, we prove that each maximal nonexpansive partial multiplier on a conditionally complete and infinitely distributive partially ordered set with upper bounded centre is inner. Finally, we show that some analogous results hold for $T_1$-families of sets partially ordered by inclusion.
Keywords: Partially ordered sets, conditional completeness and infinite distributivity, effective sets and nonexpansive multipliers
Classification (MSC2000): 06A06; 06A12, 20M14, 20M15
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