Question: Show that the language B = { < M > | the Turing machine M accepts at least two strings} is semidecidable (Turing recognizable). Hint:

Show that the language B = {< M > | the Turing machine M accepts at least two strings} is semidecidable (Turing recognizable). Hint: Describe an algorithm S that on input < M > has the following properties: (a) if M accepts at least two strings, then S accepts, (b) if M does not accept any string or if it accepts a single string, then S rejects or loops.

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