Permutation polynomials over finite fields play important roles in finite fields theory. They also have wide applications in many areas of science and engineering such as coding theory, cryptography, combinational design, communication theory and so on. Permutation binomials and trinomials attract people’s interest due to their simple algebraic form and additional extraordinary properties. In t...

the need for clean groundwater resources to have sustainable development in a country is undoubted. due to the importance and high quality of karstic waters in supplying water in iran especially in shahrood city, it is attempted in this research work to recognize and explore karstic waters in southwest of tepal area, shahrood. for this purpose, integration of the results obtained from the metho...

B.Ya. Ryabko, " Data compression by means of a book stack, Probl. Abstract-Two of the algebraic constructions for Costas arrays, designated as T4 and C,, are described in detail, and necessary and sufficient conditions are given for the sizes of Costas arrays for which these constructions occur. These constructions depend on the existence of primitive roots satisfying certain equations in finit...