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+// chapter 4
+//example 4.4
+//page 196
+Vsat=12;
+R1=1000;R2=3000;//given
+Vlt=(-(+Vsat)*R1)/R2;
+disp(Vlt)// lower threshold
+Vut=(-(-Vsat)*R1)/R2;//upper threshold
+disp(Vut)
+Vh=(R1/R2)*(Vsat-(-Vsat));//hysteresis width
+disp(Vh)
+\ No newline at end of file