Let F be an infinite field and UT(d(1),..., d(n)) be the algebra of upper block-triangular matrices over F. In this paper we describe a basis for the C-graded polynomial identities of UT(d(1),..., d(n)), with an elementary ...

This study aimed to describe, to compare and to correlate the performance of Brazilian students from the 2<su>nd</su> to the 5<su>th</su> grade of school in public and private institutions in tests of letter identification ...

“Teaching english is a challenge for elementary school teachers. Materials are a useful tool for teachers who teach English in primary school and also for students because materials help both of them to make the teaching-learning ...

This work aims to give a description, under certain hypothesis, of the graded simple algebras and prove that they are determined by their graded identities. For this, we study the papers [3] and [19]. More precisely we ...