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posted by  yizzy on 9/3/2008 1:13:49 AM  |  status: Live  

Finding the sup and inf of a set of real numbers........Please Help

Course Textbook Chapter Problem
Other Mathematical Analysis, 2nd edition, Tom M. Apostol 1 1.19
Question Details:
Find the sup and inf of each of the following sets of real numbers:
a) All numbers of the form 2-p + 3-q + 5-r , where p,q, and r take on all positive integer values.
b) S = {x: 3x2 - 10x + 3 < 0}.
c) S = {x: (x-a)(x-b)(x-c)(x-d) < 0}; where a < b < c < d.

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