# A recursively enumerable language is a formal language for which there exists a Turing machine ( or other computable function ) which will enumerate all valid strings of the language.

# A recursively enumerable language is a formal language for which there exists a Turing machine ( or other computable function ) that will halt and accept when presented with any string in the language as input but may either halt and reject or loop forever when presented with a string not in the language.

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