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2. Pythagoras tree (fractal) - Wikipedia

   en.wikipedia.org/wiki/Pythagoras_tree_(fractal)

   Iteration n in the construction adds 2 n squares of area , for a total area of 1. Thus the area of the tree might seem to grow without bound in the limit as n → ∞. However, some of the squares overlap starting at the order 5 iteration, and the tree actually has a finite area because it fits inside a 6×4 box.

3. Tree (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Tree_(graph_theory)

   Counting the number of unlabeled free trees is a harder problem. No closed formula for the number t(n) of trees with n vertices up to graph isomorphism is known. The first few values of t(n) are 1, 1, 1, 1, 2, 3, 6, 11, 23, 47, 106, 235, 551, 1301, 3159, … (sequence A000055 in the OEIS). Otter (1948) proved the asymptotic estimate

4. List of phylogenetic tree visualization software - Wikipedia

   en.wikipedia.org/wiki/List_of_phylogenetic_tree...

   an online tool for phylogenetic tree view (newick format) that allows multiple sequence alignments to be shown together with the trees (fasta format) EvolView [3] an online tool for visualizing, annotating and managing phylogenetic trees IcyTree [4] Client-side Javascript SVG viewer for annotated rooted trees. Also supports phylogenetic networks

5. Kruskal's tree theorem - Wikipedia

   en.wikipedia.org/wiki/Kruskal's_tree_theorem

   The version given here is that proven by Nash-Williams; Kruskal's formulation is somewhat stronger. All trees we consider are finite. Given a tree T with a root, and given vertices v, w, call w a successor of v if the unique path from the root to w contains v, and call w an immediate successor of v if additionally the path from v to w contains no other vertex.

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7. Parse tree - Wikipedia

   en.wikipedia.org/wiki/Parse_tree

   Parse tree of the string "aab" with respect to the production rules . A parse tree or parsing tree [1] (also known as a derivation tree or concrete syntax tree) is an ordered, rooted tree that represents the syntactic structure of a string according to some context-free grammar.

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