## On the efficiency of algorithms of analysis.(English)Zbl 0592.65032

This paper is a kind of report on the author’s preoccupations concerning the computational complexity. As the author declares, it is partly an exposition of recent results and new open problems, but also some new proofs are given here. There are four principal theorems, named A, B, C and D, twelve problems and many other theorems, lemmas and propositions.
We mention the theorem C, which is not proved in the paper: Let $$K_ A$$ be the von Neumann-Wilkinson condition number of the matrix A, $$L_ A=\log K_ A$$ and L(n) the average (with the Gauss measure) over real $$n\times n$$ matrices;
then (i) (E. Kostlan) $L(n)\leq 1+(5/2)\log n;$ (ii) (A. Ocneanu) Given any $$\epsilon >0$$, there is $$n_ 0$$ such that for $$n>n_ 0$$, $(2/3-\epsilon)\log n\leq L(n).$ Some titles are also relevant: On efficient zero finding (theorem A). On the efficiency of linear programming (th. B). On well-posed linear systems (th. C). On efficient approximation of integrals (th. D). Convergence of Newton’s method. Purely iterative algorithms. What is an algorithm? Questions of precision.
Reviewer: Gh.Marinescu

### MSC:

 65J05 General theory of numerical analysis in abstract spaces 65-02 Research exposition (monographs, survey articles) pertaining to numerical analysis 65H10 Numerical computation of solutions to systems of equations 65F10 Iterative numerical methods for linear systems 68W99 Algorithms in computer science 68Q25 Analysis of algorithms and problem complexity 90C05 Linear programming 65K05 Numerical mathematical programming methods
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