Abstract
We prove that the weak order on an infinite Coxeter group contains infinite antichains if and only if the group is not affine.
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Hultman, A. The finite antichain property in Coxeter groups. Ark Mat 45, 61–69 (2007). https://doi.org/10.1007/s11512-006-0028-3
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DOI: https://doi.org/10.1007/s11512-006-0028-3