The concept of Intuitionistic Fuzzy Graph (IFG) was introduced in 1994 in . It was an object of some subsequent extensions (see [4, 6, 12]), representations (see [2, 3, 5]) and applications (see ). In  we discussed an intuitionistic fuzzy version of the special particular case of a graph – the tree, called an Intuitionistic Fuzzy Tree (IFTree). In  we gave the index matrix (IM, see [1, 7]) interpretation and gave an example for an application of the IFTrees. Here we shall introduce operation “substitution” of a leaf of an IFTrees with whole IFTrees.
Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.
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