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**Riemann Integral**

The function x^2 is displayed and integrated in two different
ways. First with the maximal accuracy achieved by C.a.R., then as a sum. In this
case, the Riemann sum could have been computed by a simple formula.

### Technical Information

C.a.R uses the Romberg procedure to integrate. For discrete
functions, it uses a Riemann sum. The display of a discrete, filled function
reflects this sum.