latex-pictures

 % This picture represents the unit complex circle
 % Copyright Pablo (C) 2021
 \begin{tikzpicture}[scale=1.2]
   \node[above] (O) at (0,1) {$i$};
   \node[right] (O) at (1,0) {$1$};
   \filldraw[black] (0, 1) circle (1pt);
   \filldraw[black] (1, 0) circle (1pt);
   \draw (0, 0) circle (1);
 \end{tikzpicture}