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The intersection number for forcing notions

Andr\'es F. Uribe-Zapata
Feb 2024
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摘要原文
Based on works of Saharon Shelah, Jakob Kellner, and Anda T\u{a}nasie for controlling the cardinal characteristics of the continuum in ccc forcing extensions, in the author's master's thesis was introduced a new combinatorial notion: the intersection number for forcing notions, which was used in such thesis to build a general theory of iterated forcing using finitely additive measures. In this paper, we present the definition of such a notion and prove some of its fundamental properties in detail. Additionally, we introduce a new linkedness property called $\mu$-intersection-linked, prove some of its basic properties, and provide some interesting examples.
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