Let and let Ai ⊂ A and Bi ⊂ B for i = 0 and i = 1. Show that f−1 preserves inclusions, unions, intersections, and differences of sets:
(a) .
(b) .
(c) .
(d) .
Show that f preserves inclusions and unions only:
(e) .
(f) .
(g) .
(h) .
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