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Table 1 Linguistic variables and the equivalent fuzzy number [55]

From: Designing a sustainable biofuel supply chain by considering carbon policies: a case study in Iran

Linguistic variables

Membership function

Equally importance (EI)

\(\left(\mathrm{1,1},1\right)\)

Weakly important (WI)

\(\left(2/\mathrm{3,1},3/2\right)\)

Fairly important (FI)

\(\left(3/\mathrm{2,2},5/2\right)\)

Very important (VI)

\(\left(5/\mathrm{2,3},7/2\right)\)

Absolutely important (AI)

\(\left(7/\mathrm{2,4},9/2\right)\)