(6-4-15)
(6-4-17)
��C
i-k+1
(t) = [V
i
]
T
N
i
(t), i = k-1,k,…,n-k+1
(6-4-18)
=
[
B
i-k, k+1
(t), B
i-k+1, k+1
(t), …, B
i, k+1
(t)
]
T
,