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If ∑= {0,1}, then Ф* will result to:

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in Automata Theory by (51.1k points)
If ∑= {0,1}, then Ф* will result to:

(a) ε

(b) Ф

(c) ∑

(d) None of the mentioned

I had been asked this question in an interview for job.

My question comes from Building Regular Expressions in section Regular Expressions and Languages of Automata Theory

1 Answer

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The correct choice is (a) ε

The best I can explain: The star operation brings together any number of strings from the language to get a string in the result. If the language is empty, the star operation can put together 0 strings, resulting only the empty string.

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