I have been given this problem as a practice for an upcoming exam and I am unsure how to approach it.
Give and example of a function that has derivatives of all orders, but is not equal to the sum of its Taylor series. Justify your example.
I have been given this problem as a practice for an upcoming exam and I am unsure how to approach it.
Give and example of a function that has derivatives of all orders, but is not equal to the sum of its Taylor series. Justify your example.
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What you're looking for is a non-analytic smooth function. See: https://en.wikipedia.org/wiki/Non-analytic_smooth_function