1. Ivan Matveevich Vinogradov (on his 80th birthday)

   Announcement Pages: 573 - 574

2. A counterexample to the Hasse principle for a system of two quadratic forms in five variables

   • V. A. Iskovskikh

   OriginalPaper Pages: 575 - 577

3. Lucas's criterion for the primality of numbers of the form N = h2ⁿ−1

   • S. B. Stechkin

   OriginalPaper Pages: 578 - 584

4. Infinite-order differential equations with analytic solutions

   • A. F. Leont'ev

   OriginalPaper Pages: 585 - 590

5. Hilbert's boundary-value problem (with coefficients from the Wiener ring) for matrix-valued functions analytic in the unit disk

   • A. L. Lukov

   OriginalPaper Pages: 591 - 596

6. A geometric property of functions starlike of orderα

   • D. V. Prokhorov

   OriginalPaper Pages: 597 - 600

7. An example of a function which is Denjoy integrable but not khinchin summable

   • V. S. Shul'man

   OriginalPaper Pages: 601 - 604

8. Operators, absolutely indefinitely bounded below, in spaces with indefinite metric

   • V. A. Senderov

   OriginalPaper Pages: 605 - 607

9. The existence of solutions of generalized differential equations

   • A. F. Filippov

   OriginalPaper Pages: 608 - 611

10. Some continuous decompositions of the space Eⁿ

    • Van Ny Kyong

    OriginalPaper Pages: 612 - 618

11. Isometric immersions of a Euclidean plane in Lobachevskii space

    • Yu. A. Volkov
    • S. M. Vladimirova

    OriginalPaper Pages: 619 - 622

12. Nonrigidity of certain composite surfaces of revolution

    • I. Ivanova-Karatopraklieva

    OriginalPaper Pages: 623 - 629

13. Exact projective representations of Abelian groups

    • L. F. Barannik

    OriginalPaper Pages: 630 - 635

14. An optimal problem in graph theory

    • M. A. Dukhovnyi

    OriginalPaper Pages: 636 - 638

15. Generalization of the problem of the number of partitions of a finite set

    • B. I. Selivanov

    OriginalPaper Pages: 639 - 642