Let a1, a2,...,a, be real numbers that are all contained in the interval [-7 /2, 7 /2]. Use the Pigeonhole Principle to prove that there are two distinct indices i and j such that 0

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Question 3:
• Let a1, a2, ..., a7 be real numbers that are all contained in the interval [-1/2, 7/2].
Use the Pigeonhole Principle to prove that there are two distinct indices i and j such
that 0 < a; – aj < T/6.
1
• Let a1, a2, ..., a7 be real numbers such that a;a; -1 for all i + j.
Prove that there are two distinct indices i and j such that
a; – aj
1
1+ a¿aj
V3
Hint: For each i, let p; be the point with coordinates (1, a;), and consider the angle
between the x-axis and the vector from the origin to p;. You learned in high school
that
tan a – tan 3
tan(a – B)
1+ tan a tan 3
11:21 PM
10/8/2020
Transcribed Image Text:2 assignment2.pdf - Adobe Acrobat Reader DC File Edit View Sign Window Help Home Tools assignment2.pdf a2-Q.pdf a2sol.pdf DiscreteStructuresf... Sign In 2 / 4 Question 3: • Let a1, a2, ..., a7 be real numbers that are all contained in the interval [-1/2, 7/2]. Use the Pigeonhole Principle to prove that there are two distinct indices i and j such that 0 < a; – aj < T/6. 1 • Let a1, a2, ..., a7 be real numbers such that a;a; -1 for all i + j. Prove that there are two distinct indices i and j such that a; – aj 1 1+ a¿aj V3 Hint: For each i, let p; be the point with coordinates (1, a;), and consider the angle between the x-axis and the vector from the origin to p;. You learned in high school that tan a – tan 3 tan(a – B) 1+ tan a tan 3 11:21 PM 10/8/2020
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