$Σ$-algebraically compact modules and $\mathbf L_{ω_1ω}$-compact cardinals

We prove that the property Add$(M)\subseteq$ Prod$(M)$ characterizes $Σ$-algebraically compact modules if $|M|$ is not $ω$-measurable. Moreover, under a large cardinal assumption, we show that over any ring $R$ where $|R|$ is not $ω$-measurable, any free module $M$ of $ω$-measurable rank satisfies Add$(M)\subseteq$ Prod$(M)$, hence the assumption on $|M|$ cannot be dropped in general (e.g. over small non-right perfect rings). In this way, we extend results from a recent paper by Simion Breaz.

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