Fuzzy multi-objective deterministic inventory model with time dependent demand and holding cost under Pythagorean fuzzy goal programming approach

In this present study we have considered a deterministic inventory model in which we have taken deterioration as a function of time and demand function is considered initially linear for some time and next exponential. In the presence of uncertainty all the cost parameters are taken as generalized triangular fuzzy number. The proposed inventory model has been solved by fuzzy nonlinear programming approach and Pythagorean fuzzy goal programming approach. Finally we have taken numerical examples and sensitivity analysis for some cost parameters.