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Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Help me answer number 3 only.

Transcribed Image Text:(3) Prove the Generalized Triangle Inequality: if a₁, a2, ..., an € R then [a₁ + a2 + ··· + ªn| ≤ |a₁| + |a₂| + · · · + |an|.
(Hint: Use the Principle of Mathematical Induction)
(4) Let A be a nonempty subset of a bounded set B. Why does inf A and sup A exist? Show that (a) inf B ≤ inf A
and (b) sup A ≤ sup B.
(5) Show that for any real number x and a subset A of R, exactly one of the following holds: (a) x is an interior
point of A, (b) x is a boundary point of A or (c) x is an exterior point of A.
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