issue 18 publication date 2019-05-01

• Spectrum and essential spectrum of linear combinations of composition operators on the Hardy space H2
• Some properties of nilpotent Lie algebras
• Biprojectivty of Banach algebras modulo an ideal
• Balanced evaluation of suppliers performance by applying a hybrid DEMATEL-DEA approach in presence of undesirable factors
• Computing a block incomplete LU preconditioner as the by-product of block left-looking A-biconjugation process
• On Generalization of Sturm-Liouville Theory for Fractional Bessel Operator
• A new approach to using the cubic B-spline functions to solve the Black-Scholes equation
• Ranking Decision Making Units based on their profit in competition to reach a ‎standard level
• Characterization of weak fixed point property for new class of set-valued nonexpansive mappings
• Solving a new mathematical fuzzy multi-objective for supply chain of based on fuzzy necessity measure.
• presentation of a two stages method to determine the suitable benchmark and return to scale (case study: girls high school of one zone shiraz city)
• A revisit of a mathematical model for solving fully fuzzy linear programming problem with trapezoidal fuzzy numbers