Let (a1, a2, . . . , an) G1 G2 … Gn. Give a necessary and
Chapter 8, Problem 40E(choose chapter or problem)
Let (a1, a2, . . . , an) ? G1 ? G2 ? … ? Gn. Give a necessary and sufficient condition for |(a1, a2, . . . , an)| = ?
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