example 2. lowdim LP slides

images/tikz.tex

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+\documentclass[tikz, border=10pt]{standalone}
+
+\begin{document}
+
+\begin{tikzpicture}
+    % Draw the two thick lines l1 and l2
+    \draw[] (-3,0) -- (3,0) ; % Horizontal line l1 (very thick)
+    \draw[] (0,-3) -- (0,3) ; % Vertical line l2 (very thick)
+    
+    % Draw the diagonal lines
+    \draw[thick] (-3,-1) -- (3,1); % Diagonal line
+    \draw[thick] (-3,1) -- (3,-1); % Diagonal line
+
+    % Add labels
+    \node at (2.5,0.5) {$l_1$}; % label for l1
+    \node at (2.5,-0.5) {$l_2$}; % label for l2
+    \node at (3.3,0) {$l_{x_2}$};
+    \node at (0,3.3) {$l_{x_1}$};
+    % Quadrant numbers
+    \node at (1,1.5) {1};
+    \node at (-1,1.5) {2};
+    \node at (-1,-1.5) {3};
+    \node at (1,-1.5) {4};
+\end{tikzpicture}
+
+\end{document}