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familytree.js, a tool for the easy creation or updating of diagrams using these templates. Category:Family tree templates; Template:Nerva–Antonine family tree, a large example. Template:Tree list; Template:Ahnentafel
A tree structure, tree diagram, or tree model is a way of representing the hierarchical nature of a structure in a graphical form. It is named a "tree structure" because the classic representation resembles a tree , although the chart is generally upside down compared to a biological tree, with the "stem" at the top and the "leaves" at the bottom.
For example in the second tree above although it uses characters in the same place as those in the first one in this section, and there are slight misalignments because the charter widths of "=" and "─" are slightly different. When this section was originally written an example in article space provided: Family tree of the Greek gods.
Tree topology, a topology based on a hierarchy of nodes in a computer network; Tree diagram (physics), an acyclic Feynman diagram, pictorial representations of the mathematical expressions governing the behavior of subatomic particles; Outliners, a common software application that is used to generate tree diagrams; Network diagram; Tree ...
Ahnentafel style trees can be can be displayed using this template, but usually for fewer than six generations the customised ahnentafel templates are clearer (see Template:Ahnentafel/doc). There is also an ahnentafel template ({{Ahnentafel-tree}}), that is based on this one, that makes construction this tree simpler.
As special cases, the order-zero graph (a forest consisting of zero trees), a single tree, and an edgeless graph, are examples of forests. Since for every tree V − E = 1, we can easily count the number of trees that are within a forest by subtracting the difference between total vertices and total edges. V − E = number of trees in a forest.
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Edward Hitchcock's fold-out paleontological chart in his 1840 Elementary Geology. Although tree-like diagrams have long been used to organise knowledge, and although branching diagrams known as claves ("keys") were omnipresent in eighteenth-century natural history, it appears that the earliest tree diagram of natural order was the 1801 "Arbre botanique" (Botanical Tree) of the French ...