Question: tail ( L ) = { y:xy in L for some x inSigma ^ ( * * ) } Show that

" tail "(L)={y:xy in L" for some "x inSigma^(**)} Show that if L is regular, so is tail(L).22. The bead of a language is the set of all prefixes of its strings, that is," head "(L)={x:xy in L" for some "y inSigma^(**)}"."

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