Summary
If a singularn×n-matrixS is approximated byS+A, an approximation to a non-trivial solution ofSζ′=0 is obtained from a solution ξ of (S+ A)_ξ′=η′ in forming ξ/|ξ|. The vector η is here a conveniently chosen constant vector, and the error is, ifA=(a μv ),
$$O\left( {\sqrt {\mathop \sum \limits_{\mu , \nu } |a_{\mu \nu } |^2 } } \right).$$
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Ostrowski, A. Über näherungsweise Auflösung von Systemen homogener linearer Gleichungen. Journal of Applied Mathematics and Physics (ZAMP) 8, 280–285 (1957). https://doi.org/10.1007/BF01600614
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DOI: https://doi.org/10.1007/BF01600614