Solve number 2
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.7: Distinguishable Permutations And Combinations
Problem 29E
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Question
Solve number 2
![1. Let M be a set with two members a and b. Define the function
D: M X M as follows: D(a, a) = D(b, b) 0, D (a, b) D(b, a) = = r
where r is a positive real number. Prove that (M, D) is a metric space.
=
2. Let M be a set with three elements: a, b and c. Define D: M X M
as follows: D(x,x) = 0 for all x E M; D(x, y) = D(y, x) is a positive
real number for xy. Say D(a, b) = r, D(a, c) = s, D(b, c) = t with
r≤st. Prove that (M, D) is a metric space if and only if t ≤r + s.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Faeb81122-6fbf-4c63-aaf5-71689ff4fea7%2Fd5d5dab7-5498-49f2-acce-c94d76366769%2Fwupb1a3_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. Let M be a set with two members a and b. Define the function
D: M X M as follows: D(a, a) = D(b, b) 0, D (a, b) D(b, a) = = r
where r is a positive real number. Prove that (M, D) is a metric space.
=
2. Let M be a set with three elements: a, b and c. Define D: M X M
as follows: D(x,x) = 0 for all x E M; D(x, y) = D(y, x) is a positive
real number for xy. Say D(a, b) = r, D(a, c) = s, D(b, c) = t with
r≤st. Prove that (M, D) is a metric space if and only if t ≤r + s.
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