Derived varieties were invented by P. Cohn in [4]. Derived varieties of a given type were invented by the authors in [10]. In the paper we deal with the derived variety Vσ of a given variety, by a fixed hypersubstitution σ. We introduce the notion of the dimension of a variety as the cardinality κ of the set of all proper derived varieties of V included in V. We examine dimensions of some varie...

electronic commerce as one of the most important of innovation aspects in the process of doing business is used by many organizations and companies in the world. cooperatives as the main part of the country's economy have fundamental role in improving and promoting of economic. therefore, innovation methods and tools, new processes and perform business tasks such as e-commerce will play an impo...