5. Define f : (0, 1) → R by f(x) = x+1 Can one define f(0) to make f continuous Vx at 0? Explain.

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Please use this definition to solve #5 and #9
3.1 CONTINUITY OF A FUNCTION AT A POINT
DEFINITION Suppose E CR and f: E R. If xo E E, then f is continuous
at xo iff for each e > 0, there is a 8> 0 such that if
|x – xol < 8, x E E,
then
(f(x) – f(x0)| < e.
If f is continuous at x for every x E E, then we say f is continuous.
Compare this definition with the definition in the previous chapter concerning the
imit of a function at a point xn. First, for continuity at xo, the number xo must belong
to E, but it need not be an accumulation point of E. Indeed, if f :E→R with xo EE
83
Transcribed Image Text:3.1 CONTINUITY OF A FUNCTION AT A POINT DEFINITION Suppose E CR and f: E R. If xo E E, then f is continuous at xo iff for each e > 0, there is a 8> 0 such that if |x – xol < 8, x E E, then (f(x) – f(x0)| < e. If f is continuous at x for every x E E, then we say f is continuous. Compare this definition with the definition in the previous chapter concerning the imit of a function at a point xn. First, for continuity at xo, the number xo must belong to E, but it need not be an accumulation point of E. Indeed, if f :E→R with xo EE 83
x +1
1
Define f : (0, 1)→ R by f(x)
Can one define f(0) to make f continuous
Vx
at 0? Explain.
6. Prove that f(x)
Vx is continuous for all x 0.
7. Suppose f : R → R is continuous and f(r) = r² for each rational number r. Determine
f(V2) and justify your conclusion.
8. Suppose f : (a, b) →R is continuous and f(r) = 0 for each rational number rE (a, b). Prove
that f(x) = 0 for all x E (a, b).
9. Define f: (0, 1) → R by f(x) = x sin . Can one define f(0) to make f continuous at 0?
Explain.
ECE Define &: F ->R by g(x) = f(x)
Transcribed Image Text:x +1 1 Define f : (0, 1)→ R by f(x) Can one define f(0) to make f continuous Vx at 0? Explain. 6. Prove that f(x) Vx is continuous for all x 0. 7. Suppose f : R → R is continuous and f(r) = r² for each rational number r. Determine f(V2) and justify your conclusion. 8. Suppose f : (a, b) →R is continuous and f(r) = 0 for each rational number rE (a, b). Prove that f(x) = 0 for all x E (a, b). 9. Define f: (0, 1) → R by f(x) = x sin . Can one define f(0) to make f continuous at 0? Explain. ECE Define &: F ->R by g(x) = f(x)
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