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Questions related to formal languages, grammars, and automata theory

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Definition of complexity classes?

My book uses this definition for the Polynomial complexity class ($L$ is a language over $\{0,1\}$): $$\mathrm{P} = \left\{L\subseteq\{0,1\}^*\;\middle|\; \begin{array}{l} \text{there exists an algor …