List of Articles Cost function Open Access Article Abstract Page Full-Text 1 - Extension of TOPSIS for Group Decision-making Based on theType-2 Fuzzy Positive and Negative Ideal Solutions mohsen Rostamy-Malkhalifeh Open Access Article Abstract Page Full-Text 2 - On the convergence speed of artificial neural networks in the solving of linear systems A. Jafarian Open Access Article Abstract Page Full-Text 3 - Utilizing a new feed-back fuzzy neural network for solving a system of fuzzy equations A. Jafarian S. Measoomy Nia