bounded). not hec- (a) Show that if c> 0, then sup cxn = c sup xn nEN and sup (-crn) nEN = -c inf In nEN nEN where we declare that c (±0) = ±o0 and -c (too)3 F00. (b) Prove that inf xn + inf yn < inf (xn + Yn) < sup (xn +Yn) < sup r + sup y- nEN nEN nEN nEN nEN nEN

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Material :Daly analysis
1.6.6, Let (x,n)nƐN and (yn)nɛN be two sequences of real numbers (not nec-
essarily bounded).
(a) Show that if c > 0, then
sup cxn =
nEN
c sup xn
nEN
and
sup (-crn)
nEN
= -c inf In
nEN
where we declare that c (±0) =±∞ and -c (±0) = F00.
%3D
(b) Prove that
inf xn + inf yn < inf (xn + Yn) < sup (xn + Yn) < sup r + sup yn-
nEN
nEN
nEN
nEN
nEN
nEN
Show by example that each of the inequalities on the preceding line can be
strict.
Transcribed Image Text:1.6.6, Let (x,n)nƐN and (yn)nɛN be two sequences of real numbers (not nec- essarily bounded). (a) Show that if c > 0, then sup cxn = nEN c sup xn nEN and sup (-crn) nEN = -c inf In nEN where we declare that c (±0) =±∞ and -c (±0) = F00. %3D (b) Prove that inf xn + inf yn < inf (xn + Yn) < sup (xn + Yn) < sup r + sup yn- nEN nEN nEN nEN nEN nEN Show by example that each of the inequalities on the preceding line can be strict.
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