(b) If m < a1 + ... + an < M n, and v, is positive and + anVn < Mv1. + anUn| < Mvi Vn. decreasing, then mvị < ajvi + ... (c) If in (b) |Sn| < M Vn, then |a1v1 + ... + anVn| < Mv1 Vn.

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Q: A2

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Q: Show that &lt;a, b | a5 = b2 = e, ba = a2b&gt; is isomorphic to Z2.

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