Equation Icon  ( ) N∑ ∑N ∑N ∥Bu ∥ = |Buj | ≤ |Ax |∞ |k − j||djk||uk| ≤ |Ax|∞ max |k − j||djk| ∥u ∥, (8.45 ) j=0 j,k=0 k=0,...,N j=0