The indefinite integral is an antiderivative. 不定积分是反导数。
The graph of the antiderivative of the function is called the integral curve of. 函数的原函数的图形称为的积分曲线。
Theorem 2 If is continuous on the closed interval ,then = is an antiderivative of on . 如果函数在区间上连续;则函数=就是在上的一个原函数.
Definition 2 We shall often use the term indefinite integral in place of antiderivative, that is, the antiderivative of with any constant is called the indefinite integral of (or) in, denoted by. 在区间上,函数的带有任意常数项的原函数称为(或)在区间上的不定积分,记作。