(a) If a < b and c < d, prove that a + c < b +...

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(a) If a < b and c < d, prove that a + c < b + d.
(b) If 0 < a < b and 0 < c < d, prove that 0 < ac < bd.
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Introduction to Real Analysis

ISBN: 978-0471433316

4th edition

Authors: Robert G. Bartle, Donald R. Sherbert

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