Contents of Volume 20, Number 5

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Lipschitz classification of functions on a Hölder triangle

L. Birbrair; A. Fernandes; D. Panazzolo
St. Petersburg Math. J. 20 (2009), 681-686.
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Numerology of square equations

N. A. Vavilov
St. Petersburg Math. J. 20 (2009), 687-707.
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Complexity of a standard basis of a $D$-module

D. Yu. Grigoriev; A. L. Chistov
St. Petersburg Math. J. 20 (2009), 709-736.
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The spectrum of some compressions of unilateral shifts

S. Dubernet; J. Esterle
St. Petersburg Math. J. 20 (2009), 737-748.
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On homotopization of the unitary $K_1$-functor

V. I. Kopeĭko
St. Petersburg Math. J. 20 (2009), 749-755.
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On the solvability of the Neumann problem in domains with peak

V. G. Maz'ya; S. V. Poborchiĭ
St. Petersburg Math. J. 20 (2009), 757-790.
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Continuous biorthogonality of an elliptic hypergeometric function

V. P. Spiridonov
St. Petersburg Math. J. 20 (2009), 791-812.
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On the number of solutions of the congruence $xy\equiv l\pmod {q}$ under the graph of a twice continuously differentiable function

A. V. Ustinov
St. Petersburg Math. J. 20 (2009), 813-836.
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On generalized winding numbers

V. V. Chernov (Tchernov); Y. B. Rudyak
St. Petersburg Math. J. 20 (2009), 837-849.
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