Merging ${\lim }^1\mathbf{A}\ne 0$ with other nonvanishing constructions

Abstract

We develop methods for forcing ${\lim }^1\mathbf{A}\ne 0$, where $\mathbf{A}$ is a particular inverse system of abelian groups introduced by MardeÅ¡ić and Prasolov in their computation of certain strong homology groups. These methods allow us to extend previous nonvanishing results of Casarosa and Lambie-Hanson for ${\lim }^k\mathbf{A}$ for $k\ge 2$. Specifically we show that, for a given $n$, it is relatively consistent with ZFC that $\mathfrak{b}=\mathfrak{d}=\ddot{I}{‰}_n$ and ${\lim }^k\mathbf{A}\ne 0$ whenever $1\le k\le n$ (previously established with $2\le k\le n$). We also show it is relatively consistent with ZFC that $\mathfrak{b}=\mathfrak{d}=\ddot{I}{‰}_{\ddot{I}‰+2}$ and ${\lim }^k\mathbf{A}\ne 0$ for all $k\ge 1$ (previously established with $k\ge 2$). We also adapt proofs of Kamo to show that ${\lim }^1\mathbf{A}=0$ holds in many finite support iterated forcing extensions.

11 pages, comments welcome