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" ... This reality condition can be expressed in a simple inequality known as the Leggett-Garg Inequality. This is done by looking at the correlation between each observation. Since the first and last observations must always agree, then we can say the correlation C13 = 1. If the middle observation is also the same, then we can say C12 = C23 = 1. If the middle observation is always opposite, then we can say C12 = C23 = - 1. If the middle observation is random then C12 = C23 = 0. The Leggett-Garg inequality simply states that C12 + C23 - C13 must be no bigger than 1. This makes sense because the three cases give sums of 1, -3, or -1. If any experiment violates this inequality, we can say it violates the assumption of microrealism. ... "