In this paper, we obtain a characterization of bipolar fuzzy detour g-eccentric node. The concepts of bipolar fuzzy detour g-boundary nodes and bipolar fuzzy detour g-interior nodes in a bipolar fuzzy graph are examined. Also we establish the relationship between bipolar fuzzy cut node and bipolar fuzzy detour g-boundary node. Some properties of bipolar fuzzy detour g-boundary nodes, bipolar fuzzy detour g-interior nodes and bipolar fuzzy complete nodes are discussed. Bipolar fuzzy detour g-interior node and bipolar fuzzy detour g-boundary node of a bipolar fuzzy tree are introduced using maximum bipolar fuzzy spanning tree. Applications of detour g-distance, detour g-boundary node, detour g-interior node are given.
Due to the presence of two opposite directional thinking in relationships between countries and communication systems, the systems may not always be balanced. Therefore, the perfectness between countries relations are highly important. It comes from how much they were connected to each other for communication. In this study, first perfectly regular bipolar fuzzy graph is introduced and examined the regularity of nodes. Then, the relationship between the adjacent nodes and their regularity are visualized as a perfectly edge-regular bipolar fuzzy graphs. The totally accurate communication between all connected nodes is explained by introducing completely open neighborhood degree and completely closed neighborhood degree of nodes and edges in a bipolar fuzzy graph. Some algorithms and flowcharts of the proposed methods are given. Finally, two applications of these cogitation are exhibited in two bipolar fuzzy fields. The first one is in international relationships between some countries during cold-war era and the second one is in decision-making between teachers–students communication system for the improvement of teaching.
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