关于布尔代数超积上的不可比性及相关基数函数
On incomparability and related cardinal functions on ultraproducts of Boolean algebras
摘要:
设C表示布尔代数的下列基本特征之一:不可比性、展度、特征标、π-特征标、遗传Lindelof数、遗传密度。证明了存在一个布尔代数序列<B_i:i<kappa>和一个kappa上的超滤子D使得C(prod_{i<kappa} B_i/D)<|prod_{i<kappa} C(B_i)/D|.这回答了蒙克提出的一些问题。
英文摘要:
Let C denote any of the following cardinal characteristics of Boolean algebras: incomparability, spread, character, pi-character, hereditary Lindelof number, hereditary density. It is shown to be consistent that there exists a sequence <B_i:i<kappa> of Boolean algebras and an ultrafilter D on kappa such that C(prod_{i<kappa}B_i/D)<|prod_{i<kappa}C(B_i)/D|. This answers a number of problems posed by Monk.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。