Diagrams for https://mathoverflow.net/a/315551/33088

BlpP2-ZD.svg

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BlpP2-ZD.tex

\documentclass[12pt]{article}
\usepackage{stix}
\usepackage{amsmath,amssymb}
\usepackage{tikz-cd}
\tikzcdset{arrow style=math font}
\begin{document}
\begin{tikzpicture}
  \fill[opacity=0.05] (0,0) -- (4,4) -- (4,0) -- (0,0);
  \fill[opacity=0.1] (0,0) rectangle (4,-4);
  \draw[->] (0,-4.5) -- (0,4.5) node[anchor=east] {$-e$};
  \draw[->] (-1,0) -- (4.5,0) node[anchor=north] {$h$};
  \draw[->] (0,0) -- (4.5,4.5) node[anchor=north west] {$h-e$};
  \node[align=center] at (2.5,1) {$\operatorname{Nef}^1(X)$\\$P = xh-ye$};
  \node[align=center] at (2,-2) {$\operatorname{\overline{Eff}}^1(X) \smallsetminus \operatorname{Nef}^1(X)$\\$P = xh$};
\end{tikzpicture}
\end{document}