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A graph is a 3-leaf power if and only if it is a (bull, dart, gem)-free chordal graph. [6] Based on this characterization and similar ones, 3-leaf powers can be recognized in linear time. [7] Characterizations of 4-leaf powers are given by Rautenbach (2006) and Brandstädt, Le & Sritharan (2008), which also
However, according to Claudia Zaslavsky's book Tic Tac Toe: And Other Three-In-A Row Games from Ancient Egypt to the Modern Computer, Tic-tac-toe could be traced back to ancient Egypt. [6] [7] Another closely related ancient game is three men's morris, which is also played on a simple grid and requires three pieces in a row to finish. [8]
Bulbs are a combination of stem and leaves so may better be considered as leaves because the leaves make up the greater part. Caespitose: When stems grow in a tangled mass or clump or in low growing mats. Cladode (including phylloclade): A flattened stem that appears leaf-like and is specialized for photosynthesis, [4] e.g. cactus pads.
According to a 2020 study in the Journal of Political Economy by Clemson University economist Jorge Luis García, Nobel laureate James J. Heckman and University of Southern California economists Duncan Ermini Leaf and María José Prados, every dollar spent on a high-quality early-childhood programs led to a return of $7.3 over the long-term.
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Even later in his life, Adler began working on phyllotaxis, the mathematical structure of leaves on plant stems. This book, which collects several of his papers on the subject previously published in journals and edited volumes , [ 3 ] is the last of his 85 books to be published before his death.