Definition 1. The membership function of triangular fuzzy number
( / / ) j j j j c c c c is:
j j
j j j j j
j j j j j
c
x c or x c
c x c c c x c
x c c c c x c
x
j
0 ,
( ) ( ) ,
( ) ( ) ,
( ) (3.3)
where μc¯j( x )is the membership function for uncertain carbohydrate or fat nutrient of
food j per 100 g.
Human diet problem under food price uncertainty:
For a triangular fuzzy number of a price, for example
= (a-/a0/a+), a- is the lowest, a0 is the usual and a+ is the