5. Let S be a nonempty subset of R that is bounded above, with upper bound b. Prove that b = sup(S) if the following condition holds : for every e > 0 there is IE S such that b - e

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter7: Real And Complex Numbers
Section7.1: The Field Of Real Numbers
Problem 26E: Prove that if and are real numbers such that , then there exist a rational number such that ....
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i+2+3+ ·+n = zn(n+1)
5. Let S be a nonempty subset of R that is bounded above, with upper bound b.
Prove that b = sup(S) if the following condition holds : for every e > 0 there is
IE S such that b – e < x < b.
To prove this, assume that there is some real number c with the property that
c2 x for every r E S and that c < b. Show that this assumption leads to a
contradiction, and explain why the contradicted assumption proves that
b= sup(S).
Transcribed Image Text:i+2+3+ ·+n = zn(n+1) 5. Let S be a nonempty subset of R that is bounded above, with upper bound b. Prove that b = sup(S) if the following condition holds : for every e > 0 there is IE S such that b – e < x < b. To prove this, assume that there is some real number c with the property that c2 x for every r E S and that c < b. Show that this assumption leads to a contradiction, and explain why the contradicted assumption proves that b= sup(S).
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