lorenzo.pantieri” post=97609E quindi? Che cosa devo fare in concreto per disegnare quella griglia?
Così non ti piace?
`\begin{tikzpicture}[font=\small]
\begin{axis} [width=0.7\textwidth,
axis equal,
axis lines=middle,
xmin=-4,xmax=4,ymin=-1,ymax=5,
enlargelimits={abs=0.5},
xtick={-4,…,4}, xticklabels={},
ytick={-1,…,5}, yticklabels={},
grid,
xlabel=$x$,
ylabel=$y$]
\draw [thick] (axis cs:4,0) to [out=90, in=0] (axis cs:0,4)
to [out=180, in=90] (axis cs:-4,0);
\draw (axis cs:4,0) [blue,fill=blue,very thick] circle (2.0pt);
\draw (axis cs:-4,0) [blue,fill=blue,very thick] circle (2.0pt);
\end{axis}
\end{tikzpicture}`