Semi-optimal bases for linear dependencies

Semi-optimal bases for linear dependencies
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线性依赖的半最优基

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发表时间:
1985
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通讯作者:
D. E. Knuth
D. E. Knuth
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作者:
D. E. Knuth

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令A为真实或复数的M×N矩阵,让μ为给定常数≥1。如果A具有秩M,则可以选择A的M列,如果B为M×M由这些M列形成的基质,B -1 A的所有条目在绝对值中都小于或等于μ,如果μ> 1,则可以在M中找到M的多项式中的多项列。和n,与logμ成反比。
Let A be an m × n matrix of real or complex numbers, and let μ. be a given constant ≥ 1. If A has rank m, it is possible to choose m columns of A such that, if B is the m × m matrix formed by these m columns, all entries of B −1 A are less than or equal to μ in absolute value. Moreover, if μ > 1, it is possible to find m such columns in a number of steps that is polynomial in m and n and inversely proportional to log μ.