Attach you own leaf to the tree


This page is devoted to the labeling problems on the trees. Most of these problems remain a difficult graph labeling conjectures. If you know any other labeling problem related with the trees, I would be pleased to put a new leaf for you in the tree shown pictorially below.

[graceful]  [harmonious]  [magic]  [cordial-equitable] [E-cordial] [A-cordial] [H-cordial] [M-cordial]