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A multivariate Poisson theorem for the number of solutions close to given vectors of a system of random linear equations. (English. Russian original) Zbl 1282.60065
Discrete Math. Appl. 17, No. 6, 567-586 (2007); translation from Diskretn. Mat. 19, No. 4, 3-22 (2007).
Summary: We consider the number $$\xi(A, b\mid z)$$ of solutions of a system of random linear equations $$Ax = b$$ over a finite field $$K$$ which belong to the set $$X_r(z)$$ of the vectors differing from a given vector $$z$$ in a given number $$r$$ of coordinates (or in at most a given number of coordinates). We give conditions under which, as the number of unknowns, the number of equations, and the number of noncoinciding coordinates tend to infinity, the limit distribution of the vector $$(\xi(A, b\mid z (1)), \ldots, \xi(A, b\mid z (k)))$$ (or of the vector obtained from this vector by normalisation or by shifting some components by one) is the $$k$$-variate Poisson law. As corollaries we get limit distributions of the variable $$(\xi(A, b\mid z^{(1)},\ldots, z^{(k)})$$ equal to the number of solutions of the system belonging to the union of the sets $$X_r(z^{(s)})$$, $$s = 1,\ldots, k$$. This research continues a series of the author’s and V. G. Mikhailov’s studies.
##### MSC:
 60H25 Random operators and equations (aspects of stochastic analysis) 15A06 Linear equations (linear algebraic aspects) 15B51 Stochastic matrices
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##### References:
  Kopyttsev V. A., Discrete Math. Appl. 12 pp 615– (2002)  Kopyttsev V. A., Discrete Math. Appl. 16 pp 39– (2006) · Zbl 1106.60052  Mihalov V. G., Math. USSR Sbornik 23 pp 271– (1974) · Zbl 0324.60023
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