Table 1 Evaluation index importance and IVPFNs conversion rules.

From: Research on optimization of mining methods for broken ore bodies based on interval-valued pythagorean fuzzy sets and TOPSIS-GRA

Linguistic terms

IVPFNs

Perfect (VI)

([0.80,0.95], [0.00,0.15])

Very good (VG)

([0.70,0.80], [0.15,0.25])

Good (G)

([0.55,0.70], [0.25,0.40])

Medium (M)

([0.45,0.55], [0.40,0.55])

Medium bad (MB)

([0.30,0.45], [0.55,0.70])

Bad (B)

([0.20,0.30], [0.70,0.80])

Very bad (VB)

([0.00,0.20], [0.80,0.95])

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