Presenting a Fuzzy Multiobjective Mathematical Model of the Reverse Logistics Supply Chain Network in the Automotive Industry to Reduce Time and Energy

Table 4

Research variables.

Symbols	Definitions
	The amount of product flow u from the suppliers to the centers of producers p
	The amount of product flow u from the centers of producers p to the warehouse p′
	The amount of product flow u from the warehouse p′ to the distributor d
	The amount of product flow u from distributors d to the customer
	The amount of product flow u from the customer to the used car collection center j
	The amount of product flow u from the used car collection center j to the recycling centers r
	The amount of product flow u from the recovery center r to the elimination center n
	The amount of product flow u from the recovery center r to the producer p
	The amount of product flow u from the recovery center r to the supplier s
	=1 if the distribution center is at location d; otherwise, = 0
	=1 if the center of the distribution is at location j; otherwise, = 0
	=1 if the center of the distribution is at location r; otherwise, = 0
	=1 if the center of the distribution is at location n; otherwise, = 0
	The inventory amount of product u in the warehouse p′ at time t
	Inventory amount of product u at distributor d at time t
	The amount of product u from the distributor d that has not been delivered to the customer
	The amount of recycled product u from the recycling center r to the producer p