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+//Example 17.2//
+
+n=23*10^18; //m^-3  //density of conduction electron
+q=0.16*10^-18;//C //one elementary charge
+ue=0.364;//m^2/(V.s) //electron mobility of germanium
+uh=0.190;//m^2/(V.s)//hole mobility of germanium
+si=n*q*(ue+uh)
+mprintf("si = %f ohm^-1 m^-1",si)
+Eg=0.66;//eV //band gap
+k=(86.2*10^-6);//eV/K //Boltzmann constant
+T=300;//K //absolute temperature
+s0=si*%e^(Eg/(2*k*T))
+mprintf("\ns0 = %e ohm^-1 m^-1",s0)
+//Then
+T1=473;//K //absolute temperature
+s2=s0*%e^-(Eg/(2*k*T1))
+mprintf("\ns2 = %i ohm^-1 m^-1",s2)