Research Articles 

Blow-up directions at space infinity for solutions of semilinear heat equations
Yoshikazu Giga and Noriaki Umeda

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09

Spin-structures and 2-fold coverings
D. L. Gonçalves, C. Hayat and M. Mello

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29

A characterization for discrete quantum group
Ming Liu, Lining Jiang and Guosheng Zhang

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41

Representation type of one point extensions of iterated tubular Algebras
Gladys Chalom and Sonia Trepode

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51

On the index complex of a maximal subgroup and the group-theoretic properties of a finite group
Wang Xiaojing and Jiang Lining

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65

On -semiopen sets and a generalization of functions  
Erdal Ekici

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73

A note on indefinite ternary quadratic forms representing all odd integers .
 Jean Bureau and Jorge Morales

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85

Interior gradient estimate for 1-D anisotropic curvature flow
Yuko Nagase and Yoshihiro Tonegawa

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93

Some sharp weighted estimates for multilinear operators
Liu Lanzhe

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99

Spectrum of the Ap-laplacian operator
A. Anane, O. Chakrone and M. Moussa

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115

Essays

Three dimensional digital image processing using edge detectors
John Schmeelk

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131

Teorema de Jurdjevic e Kupka no grupo
Bernadete Maria Suaki Brandão

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137

Loterias esportivas e códigos
Marcelo Firer

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151

The definability of physical concepts
Adonai S. Sant'Anna

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163