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A function whose derivative is a given function. Also called antiderivative.
a. any function whose derivative is the given function, as x2, x2 + 3, x2–5, etc of 2x
b. the schema representing all such functions, here x2 + k
c. the symbolic representation of this as a function of the given function, written ∫f(x)dx where f(x) is the given function
d. the symbol ∫
a representation of any function whose derivative is a given function.