My reasoning is that both LL and {$xx \mid x\in L$} is equal to {$\emptyset$}. Is this correct?
2026-03-25 20:14:21.1774469661
Is L is the empty set, {$\emptyset$}, is it then true that LL = {$xx \mid x\in L$}?
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Do you mean that if $L=\emptyset$, then $\{xx:x\in L\}=\emptyset$?
There is no $x\in L$ to begin with, so "$x\in L$" is always false; the second set is indeed empty.