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Oct 31, 2016 at 16:18 history edited J.-E. Pin CC BY-SA 3.0
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Oct 31, 2016 at 13:51 comment added J.-E. Pin Well, if $n = 0$, $(a^{pq})^n = a^0$. If $n = 1$, $(a^{pq})^n = a^{pq}$ and if $n \geqslant 2$, then $(a^{pq})^n = a^{pqn}$. Thus $L_2 = \{a^0\} \cup \{a^r \mid r \text{ is a product of at least 2 numbers } \geqslant 2\}$. Now, what is the definition of a prime number?
Oct 31, 2016 at 13:38 comment added Akhil Nadh PC Sir, How did you find complement of $L_{2}$ ? I couldn't understand how did you get it as $P =\{ a^{p} | p$ $is$$ prime \} $
Oct 29, 2016 at 14:13 history edited J.-E. Pin CC BY-SA 3.0
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Oct 29, 2016 at 9:07 history answered J.-E. Pin CC BY-SA 3.0