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Figure 21.13.16`C619293CCE8A`

Mathematical diagram from the source — C619293CCE8A21.13.16 The fan of $\mathrm{Bl}_0\mathbb {P}^2$. Adding the ray $\sigma _7$ generated by $(1,1)$ subdivides the cone $\sigma _1$ into two full-dimensional cones $\sigma _1',\sigma _1''$.

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@misc{pome-tag-C619293CCE8A,
  author = {{Pome contributors}},
  title = {Figure 21.13.16},
  howpublished = {Pome},
  url = {https://mingchenxia.github.io/Pome/tag/C619293CCE8A/}
}

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