Preserving old ([omega]aleph0,supseteq*) is proper
Abstract
We give some sufficient and necessary conditions on a forcing notion Q for preserving the forcing notion ([omega]aleph0,supseteq*) is proper. They cover many reasonable forcing notions.
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We give some sufficient and necessary conditions on a forcing notion Q for preserving the forcing notion ([omega]aleph0,supseteq*) is proper. They cover many reasonable forcing notions.