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== Introduction ==
The general setting is as follows. We would like to construct a curve whose shape is described by a sequence of ''p'' points <math>\vec{d}_0, \vec{d}_1, \dots, \vec{d}_{p-1}</math>, which
\vec{s}(u_{p-1})=\vec{d}_{p-1}</math>. But this is not quite the case: in general we are satisfied that the curve "approximate" the control polygon. We assume that ''u<sub>0</sub>, ..., u<sub>p-1</sub>'' are given to us along with <math>\vec{d}_0, \vec{d}_1, \dots, \vec{d}_{p-1}</math>.
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