Vietnam Journal
of
MATHEMATICS
Vol. 29, Number 3, 2001

1 Non-Linear Approximations using Wavelet decompositions
Dinh Dung
197
2 Direct Sums of Type 2 c - Extending Modules
Liu Zhongkui
225
3 On Penalty Function Method for a class of Nonconvex Constrained Optimization Problems
Nguyen Van Quy and Le Dung Muu
235
4 A free boundary Problem for heat Equation Arising in Infiltration
Nguyen Dinh Tri and Nguyen Dinh Binh
257
5 Two-Weight Inequality for fractional Integral Operations and Adams Inequality
Y. Rakotondratsimba
269
6 On Multipoint Boundary-Valued Problems for Linear Implicit Non-autonomous Systems of Difference Equations
Pham Ky Anh and Le Cong Loi
281
7 Non-Singular Cubic Surfaces with Star Points
Nguyen Chanh Tu
287