Stefano

Avete ragione. Allego gli esempi minimi compilabili sia in Latex sia in formato mp.

Intanto grazie per l’attenzione.

FILE LATEX

\documentclass[a4paper,12pt]{article}
\usepackage{graphicx}
\usepackage{psfrag}
\usepackage{pgf}
\usepackage{PSTricks}
\usepackage{emp}
\usepackage{gmp}
\begin{document}

\DeclareGraphicsRule{*}{mps}{*}{}

{\begin{figure}[!h]
\begin{center}
\includegraphics[scale=0.6]{C:/Users/Stefano/Desktop/mis_rana/ranamp/gra-151.eps}
\caption{}\label{fig:semi}
\end{center}
\end{figure}}

\begin{mpost}
prologues:=3; % include all fonts
outputtemplate:=”%j-%c.eps”; % output file will be hello-1.mps
beginfig(10)
for i=0 step 1 until 360:
pair P;
P = 2cm* (sind(2*i), cosd(3*i));
fill fullcircle scaled 4mm shifted P withcolor white;
draw fullcircle scaled 4mm shifted P;
endfor;
picture p;
p:=nullpicture;
for i=-180 step 1 until 180:
pair P;
P = 2cm* (sind(2*i), cosd(3*i));
addto p contour fullcircle scaled 4mm shifted P withcolor white;
addto p doublepath fullcircle scaled 4mm shifted P
withpen pencircle scaled .5bp;
endfor;
clip p to (.5cm,2.5cm) — (.5cm,1.5cm)–
(-.5cm,1.5cm) — (-.5cm,2.5cm)–cycle;
draw p;
endfig;
\end{mpost}

\noindent Costruisci un esempio con la funzione lunghezza con la caratterizzazione numero {\it 4.} della proposizione.

\end{document}

FILE MP

prologues:=3; % include all fonts
outputtemplate:=”%j-%c.eps”; % output file will be hello-1.mps
beginfig(151)
for i=0 step 1 until 360:
pair P;
P = 2cm* (sind(2*i), cosd(3*i));
fill fullcircle scaled 4mm shifted P withcolor white;
draw fullcircle scaled 4mm shifted P;
endfor;
picture p;
p:=nullpicture;
for i=-180 step 1 until 180:
pair P;
P = 2cm* (sind(2*i), cosd(3*i));
addto p contour fullcircle scaled 4mm shifted P withcolor white;
addto p doublepath fullcircle scaled 4mm shifted P
withpen pencircle scaled .5bp;
endfor;
clip p to (.5cm,2.5cm) — (.5cm,1.5cm)–
(-.5cm,1.5cm) — (-.5cm,2.5cm)–cycle;
draw p;
endfig;

end