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By Fulton W.

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K + n + 1, and these integral formulas are essentially equivalent to those given in [14]. If we adopt the perspective of projective geometry where 6 represents a point at infinity, then we can think of the integrals of B-splines as higher-order B-splines with all the same knots and with one additional knot at infinity. Intuitively this result makes sense because integration is a smoothing operation. Thus the integral of a B-spline must be a spline of one higher degree with one more order of smoothness at each knot.

The values which emerge along the right edge of the triangle computed in this second stage are, up to constant multiples, the derivatives of the original progressive curve at t = a. Again, as in Fig. 10(a), the symbol" is used to denote homogeneous knots. for k — 0 , . . , n — 1, since differentiation and homogenization commute. (t), the diagrams of the homogeneous de Boor algorithms for p(t,w) and q(t,w) overlap (see Fig. 11). Hence it follows from Ramshaw's blossoming algorithm that the diagrams of the recursive evaluation algorithms for the blossoms of p(t) and q(i] also overlap.

Symmetry requires that the coefficient of u n '' 'uik be identical to the coefficient of Uj\ • • -Uj^. Therefore we can write any symmetric multiaffine polynomial in the form where the sum in braces is taken over all subsets of order k of the integers ( 1 , . . , n}. Thus the symmetric sums of order k form a basis for the symmetric multiaffine polynomials in n variables. 16 Algorithms for Progressive Curves There is a simple recursion formula for evaluating symmetric multiaffine polynomials which, as we shall see, is closely related to the de Boor algorithm for evaluating points on progressive curves.

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