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    • The Interplay of Ranks of Submatrices 

      Strang, Gilbert; Nguyen, Tri Dung (2004-01)
      A banded invertible matrix T has a remarkable inverse. All "upper" and "lower" submatrices of T⁻¹ have low rank (depending on the bandwidth in T). The exact rank condition is known, and it allows fast multiplication by ...