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arXiv 1802.02791math.LO
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基数不变量间的更多ZFC不等式

More ZFC inequalities between cardinal invariants

Vera Fischer, Daniel T. Soukup

摘要:

根据D. Raghavan和S.谢拉,我们目前ZFC定理的边界和各种几乎不相交数,以及对收获和支配家庭的不可数,经常基数。我们表明,如果$κ=λ^+$为一些$λ\geq ω$和$\mathfrak b(κ)=κ^+$,那么$\mathfrak a_e(κ)=\mathfrak a_p(κ)=κ^+$。此外,如果是$2^{<λ}=λ$,则也是$\mathfrak a_g(κ)=κ^+$。此外,我们证明了各种新的界限$\mathfrak d(κ)$的$\mathfrak r(κ)$,包括$\mathfrak d(κ)\leq \mathfrak r_σ(κ)\leq \mathrm{cof}([\mathfrak r(κ)]^ω)$,和$\mathfrak d(κ)\leq \mathfrak r(κ)$时,$\mathfrak r(κ)<\mathfrak b(κ)^{+κ}$或$\mathrm{cof}(\mathfrak r(κ))\leq κ$举行。

英文摘要:

Motivated by recent results and questions of D. Raghavan and S. Shelah, we present ZFC theorems on the bounding and various almost disjointness numbers, as well as on reaping and dominating families on uncountable, regular cardinals. We show that if $κ=λ^+$ for some $λ\geq ω$ and $\mathfrak b(κ)=κ^+$ then $\mathfrak a_e(κ)=\mathfrak a_p(κ)=κ^+$. If, additionally, $2^{<λ}=λ$ then $\mathfrak a_g(κ)=κ^+$ as well. Furthermore, we prove a variety of new bounds for $\mathfrak d(κ)$ in terms of $\mathfrak r(κ)$, including $\mathfrak d(κ)\leq \mathfrak r_σ(κ)\leq \mathrm{cof}([\mathfrak r(κ)]^ω)$, and $\mathfrak d(κ)\leq \mathfrak r(κ)$ whenever $\mathfrak r(κ)<\mathfrak b(κ)^{+κ}$ or $\mathrm{cof}(\mathfrak r(κ))\leq κ$ holds.

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