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A comment on Calculus Is Deeply Irrational. Parent comment

Re:Calculus Is Deeply Irrational by OscarCunningham on Wednesday August 21, 2019 @02:26AM (#20754964)
Can a function have that property at every point?
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Re:Calculus Is Deeply Irrational by im3w1l on Wednesday August 21, 2019 @03:16AM (#20755135)
No. https://math.stackexchange.com/questions/1342427/if-a-functi...
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