Results 271 to 280 of about 1,110,706 (305)
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Journal of Symbolic Logic, 1971
This is an attempt to give a survey of recent results concerning trees. The article is an extended version of our talk in Oberwolfach (Schwarzwald) last May; the forests surrounding the Forschungsinstitut turned out to be a good inspiration.A tree is a partially ordered set T = (T, ≤) such that for every x ∈ T, the set = {y ∈ T: y < x} is well ...
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This is an attempt to give a survey of recent results concerning trees. The article is an extended version of our talk in Oberwolfach (Schwarzwald) last May; the forests surrounding the Forschungsinstitut turned out to be a good inspiration.A tree is a partially ordered set T = (T, ≤) such that for every x ∈ T, the set = {y ∈ T: y < x} is well ...
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Molecular Ecology, 1998
The practice of tracking geographical divergence along a phylogenetic tree has added an evolutionary perspective to biogeographic analysis within single species. In spite of the popularity of phylogeography, there is an emerging problem. Recurrent mutation and recombination both create homoplasy, multiple evolutionary occurrences of the same character ...
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The practice of tracking geographical divergence along a phylogenetic tree has added an evolutionary perspective to biogeographic analysis within single species. In spite of the popularity of phylogeography, there is an emerging problem. Recurrent mutation and recombination both create homoplasy, multiple evolutionary occurrences of the same character ...
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Interpreting Tree-to-Tree Queries
2006We establish correspondences between top-down tree building query languages and predicate logics. We consider the expressive power of the query language XQ, a clean core of the practitioner's language XQuery. We show that all queries in XQ with only atomic equality are equivalent to “first-order interpretations”, an analog to first-order logic (FO) in ...
Michael Benedikt, Christoph Koch 0001
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THE TREE-TO-TREE EDITING PROBLEM
International Journal of Pattern Recognition and Artificial Intelligence, 1988This paper describes the computing alogrithms for the tree distance based on the structure preserving mapping. The distance is defined as the minimum sum of the weights of edit operations needed to transform tree Tα to tree Tβ under restriction of the structure preserving mapping.
Eiichi Tanaka, Keiko Tanaka
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Trees and Tree-Equivalent Graphs
Canadian Journal of Mathematics, 1965As is well known in the theory of graphs a tree is a connected graph without cycles. Many characterizing properties of trees are known (1), for example the cyclomatic number is equal to zero, which is also equal to p — 1, where p is the number of connected components of the graph.
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Biopolymers Derived from Trees as Sustainable Multifunctional Materials: A Review
Advanced Materials, 2021Chao Liu, Detao Liu, Qiang Li
exaly