The people who brought you Mathematica, one of the leading mathematics applications, have created a simple web site that promises to "do integrals as the world has never seen before." Users enter an integral (instructions for suitable notation are given at the site) and then press the "DO IT!" button. The answer is returned in one of four user-selected formats: text, ASCII, standard form, and traditional form. The last form is returned as an image, so that Greek letters are displayed correctly. The site also offers some background on integration: uses of integrals, the history of integration, and how the Integrator works. Of course, there is a link to information on the full version of Mathematica at the bottom of the page.
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