5.3 The Fundamental Theorem of Calculus - OpenStax
https://openstax.org/books/calculus-volume-1/pages/5-3-the-fundamental-theorem-of-calculus
WebBefore we delve into the proof, a couple of subtleties are worth mentioning here. First, a comment on the notation. Note that we have defined a function, F (x), F (x), as the definite integral of another function, f (t), f (t), from the point a to the point x.At first glance, this is confusing, because we have said several times that a definite integral is a number, and here …
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