In the context of complexity theory, \( E \) typically refers to the complexity class of problems that can be solved by a deterministic Turing machine in exponential time. More formally, a decision problem is in \( E \) if there exists a deterministic Turing machine that can solve the problem in time \( 2^{p(n)} \) for some polynomial \( p(n) \), where \( n \) is the size of the input.
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