arXiv:2611.00118v1 Announce Type: new Abstract: The regular ideal right-angled 24-cell has volume $4 \pi^2/3$ and is the unique minimum-volume entirely ideal right-angled hyperbolic four-polytope. We prove that the next distinct volume is $8 \pi^2/3$ and that its unique equality case is the reflection double of the 24-cell across one octahedral facet. We also show that an entirely ideal right-angled four-polytope whose facets are regular ideal octahedra or their doubles across triangular faces decomposes into a chain of regular 24-cells, with opposite cutting facets in each intermediate cell.
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