Function contraction theorem Let (X, d) be a complete metric space. Suppose that f: XX satisfies d(f(x), f(y)) ≤ 2-¹d(x, y) for all x, y ≤ X. Show that there exists a unique point x* EX such that f(x*) = x*.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 27E: 27. Let , where and are nonempty. Prove that has the property that for every subset of if and...
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Function contraction theorem
Let (X, d) be a complete metric space.
Suppose that f: XX satisfies
d(f(x), f(y)) ≤ 2-¹d(x, y) for all x, y E X.
Show that there exists a unique point x* EX such that f(x*) = x*.
Problem 5 Hint:
i=0
Step 1. Let xo E X. Define a sequence {x} by the recurrence relation
xi = f(xi-1) for i=1,2,....
Step 2. Show that {x}
Step 3. Show that x* is the point of interest.
converges to a point x* by showing that it is Cauchy.
Transcribed Image Text:Function contraction theorem Let (X, d) be a complete metric space. Suppose that f: XX satisfies d(f(x), f(y)) ≤ 2-¹d(x, y) for all x, y E X. Show that there exists a unique point x* EX such that f(x*) = x*. Problem 5 Hint: i=0 Step 1. Let xo E X. Define a sequence {x} by the recurrence relation xi = f(xi-1) for i=1,2,.... Step 2. Show that {x} Step 3. Show that x* is the point of interest. converges to a point x* by showing that it is Cauchy.
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