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1988
If (n+1) ordered position vectors Q0, Q1, ..., Qn−1, Q n are given (Fig. 6.1), consider the (n−2) linear combinations: $$ {P_i}(t) = {X_0}(t){Q_{i - 1}} + {X_1}(t){Q_i} + {X_2}(t){Q_{i + 1}} + {X_3}(t){Q_{i + 2}}(i = 1,2,...,n - 2)$$ (6.1) each formed from four successive points.
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If (n+1) ordered position vectors Q0, Q1, ..., Qn−1, Q n are given (Fig. 6.1), consider the (n−2) linear combinations: $$ {P_i}(t) = {X_0}(t){Q_{i - 1}} + {X_1}(t){Q_i} + {X_2}(t){Q_{i + 1}} + {X_3}(t){Q_{i + 2}}(i = 1,2,...,n - 2)$$ (6.1) each formed from four successive points.
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