Fig. 4
The k-the projection (k=1,2,3). This figure explained and compute the 3-polar fuzzy set \( \overline{\mathcal{A}}\in {\left({\left[0,60\right]}^3\right)}^X \), defined by \( {p}_k{}^{\circ}\overline{\mathcal{A}}=60\wedge {\sum}_{i\in I}{p}_k{}^{\circ}\mathcal{A}(x)\kern1.25em \left(\forall x\in X\right),\kern0.5em \) where pk : [0, 60]3 → [0, 60] is the k-the projection (k=1,2,3)