d(x, A) = inf {|x – y| : y E A}. Show that d(x, A) = 0 if and only if x is an element of the closure A. 7. Which of the following functions f: (0, 1) → R are uniformly continuous? Explain. f(x) = x³ + 3x, f (x) = Vx, f(x) = tan(1/x).

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter6: Vector Spaces
Section6.5: The Kernel And Range Of A Linear Transformation
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7
d(x, A) = inf {|x – y| : y E A}.
Show that d(x, A) = 0 if and only if x is an element of the closure A.
7. Which of the following functions f: (0, 1) –→ R are uniformly continuous? Explain.
f(x) = x³ + 3x,
f (x) = Vx,
f(x) = tan(1/x).
8. Consider a sequence {Cn} of nonempty compact subsets of R such that Cn+1 C Cn for
Transcribed Image Text:d(x, A) = inf {|x – y| : y E A}. Show that d(x, A) = 0 if and only if x is an element of the closure A. 7. Which of the following functions f: (0, 1) –→ R are uniformly continuous? Explain. f(x) = x³ + 3x, f (x) = Vx, f(x) = tan(1/x). 8. Consider a sequence {Cn} of nonempty compact subsets of R such that Cn+1 C Cn for
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