2. Let g : R → R be a bounded function and define f : R\ {0} → R by 1 f(x) = g(x)+ x2 Using only the definition above, and without using any limit rules, prove that f(x) → +∞ as x → 0.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Definition: Let a E R and f : R {a} → R be a function. We say that f(x) → +∞ as x → a
if and only if for every real number M there exists a positive d such that, for all real x with
x - a| < 8 and x+ a, we have f (x) > M.
Notice the similarities between this and Ross (1), page 160. The inequality |f(x) – L| <ɛ (this
says 'f(x) is close to L') has been replaced by f(x) > M (this says 'f(x) is large’.)
2. Let g : R → R be a bounded function and define f : R {0} →R by
1
f(x) = g(x)+
x2
Using only the definition above, and without using any limit rules, prove that f (x) → +∞ as x → 0.
Transcribed Image Text:Definition: Let a E R and f : R {a} → R be a function. We say that f(x) → +∞ as x → a if and only if for every real number M there exists a positive d such that, for all real x with x - a| < 8 and x+ a, we have f (x) > M. Notice the similarities between this and Ross (1), page 160. The inequality |f(x) – L| <ɛ (this says 'f(x) is close to L') has been replaced by f(x) > M (this says 'f(x) is large’.) 2. Let g : R → R be a bounded function and define f : R {0} →R by 1 f(x) = g(x)+ x2 Using only the definition above, and without using any limit rules, prove that f (x) → +∞ as x → 0.
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