en.wikipedia.org/wiki/Integral

The next significant advances in integral calculus did not begin to appear until
the 17th century. At this time the work of ...

www.khanacademy.org/math/integral-calculus

Integral calculus gives us the tools to answer these questions and many more.
Surprisingly, these questions are related to the derivative, and in some sense, the
...

www.khanacademy.org/math/calculus-home/integration-calc

The big idea of integral calculus is the calculation of the area under a curve using
integrals. What does this have to do with differential calculus? Surprisingly ...

www.mathsisfun.com/calculus/integration-introduction.html

Calculus Index ... Integration can be used to find areas, volumes, central points
and many useful things ... finding an Integral is the reverse of finding a Derivative.

tutorial.math.lamar.edu/Classes/CalcII/IntTechIntro.aspx

Integration Techniques. In this chapter we are going to be looking at various
integration techniques. There are a fair number of them and some will be easier ...

tutorial.math.lamar.edu/Classes/CalcI/IntegralsIntro.aspx

Indefinite Integrals In this section we will start with the definition of indefinite
integral. This section will be devoted mostly to the definition and properties of ...

tutorial.math.lamar.edu/Classes/CalcI/DefnOfDefiniteIntegral.aspx

Given a function that is continuous on the interval [a,b] we divide the interval into
n subintervals of equal width, , and from each interval choose a point, . Then the ...

www.integral-calculator.com/

The Integral Calculator lets you calculate integrals and antiderivatives of
functions ... Our calculator allows you to check your solutions to calculus
exercises.

tutorial.math.lamar.edu/Classes/CalcI/IndefiniteIntegrals.aspx

In this definition the is called the integral symbol, is called the integrand, x is
called the integration variable and the “c” is called the constant of integration.

mathworld.wolfram.com/Integral.html

An integral is a mathematical object that can be interpreted as an area or a ...
Integrals, together with derivatives, are the fundamental objects of calculus.