The law of superposition states: If an input variable (xe1) brings about an output variable (xa1) and also another input variable (xe2) brings about an output variable (xa2), therefore:
![c72912f540cf3fa7ae6cc6a817a12760dbddf763 ueberlagerungsgesetz_01.gif](/fileadmin/smc/files/c72912f540cf3fa7ae6cc6a817a12760dbddf763.gif)
if the law of superposition applies, the sum of the input variables (xe1 + xe2) is therefore equal to the sum of the output variables (DIN 19 226):
![3cba35aaac2ad83366bad584f87a437b42c98c48 ueberlagerungsgesetz_02](/fileadmin/smc/files/3cba35aaac2ad83366bad584f87a437b42c98c48.gif)