sentences:  This is usually stated by declaring that two states which are a multiple of one another are the same as far as the description of the situation is concerned.Either of these describe the same state for any nonzero formula_14
  
  The fundamental law of quantum mechanics is that the evolution is linear, meaning that if state A turns into A′ and B turns into B′ after 10 seconds, then after 10 seconds the superposition formula_16 turns into a mixture of A′ and B′ with the same coefficients as A and B.For example, if we have the following
  
  Then after those 10 seconds our state will change to
  
  So far there have just been 2 configurations, but there can be infinitely many.