=+ (b) Show that for nonempty a, f() is the class of sets of the form Un

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(b) Show that for nonempty

a, f() is the class of sets of the form Un ;, A ., where for each i and j either A, E & or AGE, and where the m sets n ,, A .,, 1 sism, are disjoint. The sets in f( ) can thus be explicitly presented, which is not in general true of the sets in o( ! ).

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