Pome

Figure 21.13.83F8805F2A5BD0

Mathematical diagram from the source
F8805F2A5BD021.13.83 The face $Q_{\sigma _7}=\{ m\in P_ D:\langle m,(1,1)\rangle =0\} $ is the single point $\{ (0,0)\} $, of dimension $0$ rather than the expected $1$.
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