**TOME 49 (97), No. 1, 2006**- In Honour of Professor Ion D. Ion's 70th Anniversary, p. 3
**Crina Boboc and S. Dăscălescu :**Good gradings of matrix algebras by finite abelian groups of prime index, p. 5-11**Dumitru Buşneag and Dana Piciu :**Residuated lattice of fractions relative to a Λ-closed system, p. 13-24**N. Chifan, C. Nastasescu and B. Torrecillas :**Semiprime graded rings of finite support, p. 25-30**Jim Coykendall and Tiberiu Dumitrescu :**An infinite product of formal power series, p. 31-36**Iuliu Crivei and Septimiu Crivei :**(m, n)-purity for modules, p. 37-46**Alexandru Gica :**Cumulative sum of the Liouville function related to Gauss's problem of the tenth field, p. 47-53**Ion. D. Ion and Constantin Niţă :**Ultraproducts of transitive rings of linear transformations, p. 55-60**Mihai Iosif :**Note on self-injective modules having finite Goldie dimension, p. 61-62**Gabriel Mincu and Laurenţiu Panaitopol :**On some properties of squarefree and squareful numbers, p. 63-68**Laurenţiu Panaitopol and Doru Ştefănescu :**Polynomial Factorizations, p. 69-74**Dorin Popescu and Marius Vladoiu :**Strong Lefschetz property on algebras of embedding dimension three, p. 75-86**Sergiu Rudeanu :**On unary lattice functions and Boolean functions, p. 87-98**Mirela Stefanescu :**Some interpretations of hypergroups, p. 99-104**Cristian Voica :**On a property of conics, p. 105-110