Question: 79. (i) If Gis transitive over flEx w and V(X, 8) is maximal invariant under G, then V( X, 0) is pivotal. (ii) By (i),

79. (i) If Gis transitive over flEx w and V(X, 8) is maximal invariant under G, then V( X, 0) is pivotal. (ii) By (i), any quantity W( X, 8) which is invariant under Gis pivotal; give an example showing that the converse need not be true.

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