SFI Working Papers contain accounts of scienti5ic work of the author(s) and do not necessarily represent the views of the Santa Fe Institute. We accept papers intended for publication in peer-reviewed journals or proceedings volumes, but not papers that have already appeared in print. Except for papers by our external faculty, papers must be based on work done at SFI, inspired by an invited vis...

The paper sets forth in detail categorically-algebraic or catalg foundations for the operations of taking the image and preimage of (fuzzy) sets called forward and backward powerset operators. Motivated by an open question of S. E. Rodabaugh, we construct a monad on the category of sets, the algebras of which generate the fixed-basis forward powerset operator of L. A. Zadeh. On the next step, w...

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...

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 i...

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 i...

The ability of uropathogenic E. coli (UPEC) to cause symptomatic UTI is associated with the expression of a variety of virulence factors. Biofilm formation enables UPEC to resist the flow of urine and increases its tolerance to antimicrobials and the host immune response. The measurement of biofilm formation in vitro is affected by the type of culture medium used. The aim of this study was to e...