Question: 1.*11. Let ':!ft {X} be the minimal B.F. with respect to which X is measurable. Show that A E ~ {X} if and only if

1.*11. Let ':!ft {X} be the minimal B.F. with respect to which X is measurable.

Show that A E ~ {X} if and only if A = X I (B) for some B E qjl. Is this B unique? Can there be a set A rt. /231 such that A -X-I (A)?

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