Two X-trees T1 and T2 are considered isomorphic if there is a graphisomorphism between them that retains the leaf labels. For rooted X trees, isomorphism must also preserve the root. In the mathematical field of graph theory is a concordance forest for two given trees (labeled in leaves, irreducible) of any forest (labeled in leaves, irreducible) that can be obtained informally speaking of the two trees by removing a common number of edges. In the case of an X-Baum T and a sub-quantity of taxin Y ⊆ X, the minimum sub-tree of T, which connects all the leaves in Y, is called T (Y). If T is rooted, then T (Y) is also rooted, its root being the closest node to the original root of T. This T(Y) subfruit does not need to be a Y tree, as it may not be misled. The Buttonwood Agreement is the founding document of the current New York Stock Exchange and one of the most important financial documents in U.S. history.  The agreement organized securities trading in New York and was signed on May 17, 1792 between 24 brokers outside 68 Wall Street. According to legend, the signature took place under a platanus occidentalis, a tree made of button wood, but this tree may never have existed.
 The New York Stock Exchange celebrates the signing of this agreement on May 17, 1792 as its creation.  The Economist, a London-based weekly, named its financial markets column after the agreement. The size of an overall chord structure is simply the number of components. Intuitively, a k-size forest for two phylogenetic trees is a forest that can be preserved by both trees by removing (k-1) edges in each tree and then removing the internal grade 2 nodes. The Court of Appeal issued a decision confirming that the term „tree“ includes potential plants and trees for the purposes of a tree protection order or tree replacement by-law; although it does not contain seeds. . . .