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To establish the corresponding relation, let us first recall the definition of the backward difference operator [nabla].
n] is due to our representation of the cardinal B-spline via backward difference operators.
where [DELTA] f (x) = f (x + 1) - f (x) and [nabla] (x) = f (x) - f (x - 1) denote the forward and backward difference operators, respectively.

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