{\displaystyle {\begin{aligned}D_{\Phi }(A,B)&=inf\left\{d(\Phi (a),\Phi (a)):\Phi (a)\in {\mathcal {Q}}(A),\Phi (a)\in {\mathcal {Q}}(B)\right\},\\d(\Phi (a),\Phi (a))&=\mathop {\sum } _{i=1}^{n}|\phi _{i}(a)-\phi _{i}(b)|,\\\delta _{\Phi ,\varepsilon }&=\left\{(A,B)\in 2^{X}\times 2^{X}:|D({\mbox{cl}}(A),{\mbox{cl}}(B))|<\varepsilon \right\}.\end{aligned}}}