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. Complexity functions. What would be a good complexity function f(n)? f(n 1) >= f(n) f(n) can be computed within time/space it allows: there is a TM Mf that on input x with n = |x| writes f(n) in unary on its output tame, and works in time O(n f(n)) and space O(f(n)) called proper complexity
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