Exercise 4:[Challenge] Letf be a function that is everywhere differentiable. Prove that f' has no jump dis- continuities or removable discontinuities. Remark: I consider this exercise important, since it shows that there exist many functions that are not the derivative of another function. We will show next quarter that every continuous function is the derivative of some function.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Question

ex4 hw4

Exercise 4:[Challenge] Letf be a function that is everywhere differentiable. Prove that f' has no jump dis-
continuities or removable discontinuities.
Remark: I consider this exercise important, since it shows that there exist many functions that are
not the derivative of another function. We will show next quarter that every continuous function is the
derivative of some function.
Transcribed Image Text:Exercise 4:[Challenge] Letf be a function that is everywhere differentiable. Prove that f' has no jump dis- continuities or removable discontinuities. Remark: I consider this exercise important, since it shows that there exist many functions that are not the derivative of another function. We will show next quarter that every continuous function is the derivative of some function.
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