Edge <i>δ</i>− Graceful Labeling for Some Cyclic-Related Graphs

<div>The friendship graphs Fr<sub>9</sub> with edge 5− graceful labeling and Fr<sub>10</sub> with edge 6− graceful labeling.</div>

Advances in Mathematical Physics

Figure 18: Edge <i>δ</i>− Graceful Labeling for Some Cyclic-Related Graphs 