00 An = nnAn E M . Show that a a-field is a field that is also a monotone class and conversely, a field that is a monotone class is a a-field. 42. Assume Pis a rr-system (that is, Pis closed under finite intersections) and M is a monotone class. (Cf. ) Show P C M does not imply a(P) c M . 43. Symmetric differences.
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