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A brief overview of the condition number
  Aaron Acton (ANSYS, Inc.)
  "This article presents an overview of the condition number for a matrix and the potential effect of ill conditioning on the solution of a system of linear equations. The information is intended to be general, although specifi c information relevant to finite-element analysis is also included. Vector and matrix norms are introduced before de fining the condition number, and the choice of matrix norm in the calculation of the condition number is discussed. A method of estimating the condition number is also provided, including a sample implementation in the ANSYS Parametric Design Language (APDL)."
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