Vietnam Journal
of
MATHEMATICS
Vol. 29, Number 1, 2001

1 Detection of Cavities in Solids and Solutions of Elliptic Equations and Systems
Dang Dinh Ang
1
2 A Note on the Property of Infinitely Differentiable Functions
Hoang Mai Le
15
3 On the Mohebi-Radjabalipour Conjecture
Mingxue Liu
19
4 The Bundle Structure of Spherical Non-Commutative Tori
Chun-Gil Park
27
5 Some Properties on Marginal Extensions and the Baer-Invariant of Groups
M. R. R. Moghaddam, A. R. Salemkar, and A. Gholami
39
6 Common Fixed Points for Condensing and Compact Mappings
Tran Thi Lan Anh
47
7 Calibrated Foliations and Invariant Metrics
Vu Thi Thu Ha
53
8 Generalized Indices of Graphs
Zhou Bo
67
9 Weighted Inequalities for Multi-Dimensional Hardy Operators
Yves Rakotondratsimba
71
10 Characterization of Singular Integral Equations
Nguyen Tan Hoa
79
11 Stability Radii of Linear Functional Differential Equations
Nguyen Khoa Son and Pham Huu Anh Ngoc
85
12 A-Decomposability of the Modular Invariants of Linear Groups
Nguyên Huu Viêt Hung and Trân Ngoc Nam
91