(= (add-intervals [1 2] [3 4]) [4 6])
(= (multiply-intervals [1 2] [3 4]) [3 8])
We can express any continuous real function as a function of intervals using its set of extrema. For example, the square of the interval [-2,2] is [0,4] and the square of the interval [2,3] is [4,9].
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