We define what it means for a condensed group action to be open (following [1]) and show that for open subgroups, many elementary results about abstract modules hold for condensed modules, such as the existence of Mackey's Formula for condensed groups. We also indicate how these results can be "solidified" to obtain their solid versions.
Keywords: Condensed Mathematics, Mackey's Formula
2020 MSC: 18B25
Theory and Applications of Categories, Vol. 45, 2026, No. 33, pp 1357-1369.
Published 2026-05-28.
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