Complexity Classes
Many circuit complexity classes are defined in terms of class hierarchies. For each nonnegative integer i, there is a class NCi, consisting of polynomial-size circuits of depth, using bounded fan-in AND, OR, and NOT gates. We can talk about the union NC of all of these classes. By considering unbounded fan-in gates, we construct the classes ACi and AC. We construct many other circuit complexity classes with the same size and depth restrictions by allowing different sets of gates.
Read more about this topic: Circuit Complexity
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