Fan of the affine line
= Fan of the affine line
The fan $\{0,\mathbb R_{\geq0}\}$ in $\mathbb R$ defines the affine line $\mathbb A^1$.
= Fan of the affine line
The fan $\{0,\mathbb R_{\geq0}\}$ in $\mathbb R$ defines the affine line $\mathbb A^1$.