Vietnam Journal
of
MATHEMATICS

Volume 22, Numbers 3&4, 1994


1

Some solved and unsolved problems on group rings

K. W. Roggenkamp

1

2

Các nhóm nguồn g của lớp đồng chất Γp(n,n(n-1)/2) với E1(g)=pn(n+1)/2-1, p>2
Nguyễn Ngọc Châu

33

3

Distribution and variance of stereological estimators of volume and surface area
Dao Huu Ho

41

4

On the law of large numbers of Hsu-Robbins type in non-commutative probability

Nguyen Van Quang

50

5

On the smoothness of global solutions of Hamilton-Jacobi equations
Nguyen Hoang

59

6

A representation theorem for Skorohod martingales

Nguyen Minh Duc

68

7

Numerical solution for nonlinear periodic boundary-value problems
Pham Ky Anh and Bui Duc Tien

83

8

A characterization of artinian modules

Ngo Si Tung

110

9

A complete proof of Beauville’s conjecture

Nguyen Khac Viet

114

10

Some results on SI-rings

Dinh Van Huynh, Hong Kee Kim and Jae Keol Park

117

11

Rings for which direct sums of certain CS-modules are CS

Dinh Van Huynh and Bruno J. Müller

120