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Questions related to computability theory, a.k.a. recursion theory

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Language of TMs that accept some x in less than 50 steps. Is it in co-RE?

https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-045j-automata-computability-and-complexity-spring-2011/lecture-notes/MIT6_045JS11_lec09.pdf Page 42 Credits : Nancy Lynch MIT …
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