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2. Euclid's orchard - Wikipedia

   en.wikipedia.org/wiki/Euclid's_orchard

   In mathematics, informally speaking, Euclid's orchard is an array of one-dimensional "trees" of unit height planted at the lattice points in one quadrant of a square lattice. [1] More formally, Euclid's orchard is the set of line segments from ( x , y , 0) to ( x , y , 1) , where x and y are positive integers .

3. Tree (graph theory) - Wikipedia

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

   In graph theory, a tree is an undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. [1] A forest is an undirected graph in which any two vertices are connected by at most one path, or equivalently an acyclic undirected graph, or equivalently a disjoint union of trees.

4. Centered tree - Wikipedia

   en.wikipedia.org/wiki/Centered_tree

   On the left a centered tree, on the right a bicentered one. The numbers show each node's eccentricity. In the mathematical subfield of graph theory, a centered tree is a tree with only one center, and a bicentered tree is a tree with two centers. Given a graph, the eccentricity of a vertex v is defined as the greatest distance from v to any ...

5. List of symbols - Wikipedia

   en.wikipedia.org/wiki/List_of_symbols

   Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... Tree of Life; Tree of Peace; Trefoil; Trimurti; Triple ...

6. Patterns in nature - Wikipedia

   en.wikipedia.org/wiki/Patterns_in_nature

   Centuries later, Leonardo da Vinci (1452–1519) noted the spiral arrangement of leaf patterns, that tree trunks gain successive rings as they age, and proposed a rule purportedly satisfied by the cross-sectional areas of tree-branches. [4] [3] In 1202, Leonardo Fibonacci introduced the Fibonacci sequence to the western world with his book ...

7. Animal Stories, Videos, Photos and Heroics - AOL.com

   www.aol.com/animals

   Get a daily dose of cute photos of animals like cats, dogs, and more along with animal related news stories for your daily life from AOL.