Question: Exercise 4.24 Prove that if x is not an endpoint of a partition interval (this excludes countably many points), then f is continuous at x

Exercise 4.24 Prove that if x is not an endpoint of

Exercise 4.24 Prove that if x is not an endpoint of a partition interval (this excludes countably many points), then f is continuous at x iff u(x)=f(x)=l(x)

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