Examples of using Partial order in English and their translations into Russian
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Such a diagram, with labeled vertices, uniquely determines its partial order.
Equivalently, these are the graphs in which the partial order of closed neighborhoods,ordered by set inclusion, has width at most four.
As a consequence, a relation is transitive and asymmetric if andonly if it is a strict partial order.
The topology of abstract cell complexes is based on a partial order in the set of its points or cells.
An incomparability graph is an undirected graph that connects pairs of elements that are not comparable to each other in a partial order.
Suppose that an infinite partial order P has width w, meaning that there are at most a finite number w of elements in any antichain.
Ordinarily the human understanding accepts this undercurrent andtries to reduce it to a partial order and sequence;
The 5-vertex cycle graph has a neighborhood partial order of width five, so four is the maximum width that ensures perfect orderability.
A similar method has been followed by Schnyder to prove enhanced bounds anda characterization of planarity based on the incidence partial order.
The first method is based on introduction of a partial order relation on the set of criteria and the second leans selection of the most important groups of criteria.
In graph theory,a comparability graph is an undirected graph that connects pairs of elements that are comparable to each other in a partial order.
In this partial order, there is an order relation x< y when x is a vertex, y is an edge, and x is one of the two endpoints of y.
The graphs with transitive orientations are called comparability graphs; they may be defined from a partially ordered set by making two elements adjacent whenever they are comparable in the partial order.
A properties inclusion partial order between derived from the context formal concepts appears which is known as inheritance of properties in object-oriented analysis.
The translation method consists of three main stages: generation of the MSC internalrepresentation called a partial order graph, processing of the partial order graph and translation of the graph into CPN.
If the partial order has at most one minimal element, or it has at most one maximal element, then it may be tested in linear time whether it has a non-crossing Hasse diagram.
A comparability graph is an undirected graph formed from a partial order by creating a vertex per element of the order, and an edge connecting any two comparable elements.
A partial order or total order< on a set X is said to be dense if, for all x and y in X for which x< y, there is a z in X such that x< z< y.
A dual of Dilworth's theorem states that the size of the largest chain in a partial order(if finite) equals the smallest number of antichains into which the order may be partitioned Mirsky 1971.
The partial order N with the four elements a, b, c, and d and exactly the three order relations a≤ b≥ c≤ d is an example of a fence or zigzag poset; its Hasse diagram has the shape of the capital letter"N.
A number of results on upward planarity andon crossing-free Hasse diagram construction are known: If the partial order to be drawn is a lattice, then it can be drawn without crossings if and only if it has order dimension at most two.
It is possible to define a partial order on the set of all tagged partitions by saying that one tagged partition is bigger than another if the bigger one is a refinement of the smaller one.
Series composition is an associative operation: one can write P; Q; R as the series composition of three orders, without ambiguity about how to combine them pairwise, because both of the parenthesizations(P; Q); R and P;(Q; R)describe the same partial order.
But the only nontrivial chains in the partial order are pairs of elements corresponding to the edges in the graph, so the nontrivial chains in P form a matching in the graph.
The Hasse diagram of a partially ordered set is a directed acyclic graph whose verticesare the set elements, with an edge from x to y for each pair x, y of elements for which x≤ y in the partial order but for which there does not exist z with x≤ y≤ z.
One can represent any partial order as a family of sets, such that x<y in the partial order whenever the set corresponding to x is a subset of the set corresponding to y.
A partially ordered set forms a complete lattice if and only if every subset of elements has a unique greatest lower bound and a unique least upper bound, andthe order dimension of a partially ordered set is the least number of total orders on the same set of elements whose intersection is the given partial order.
Equivalently, it is the smallest set of partial orders that includes the single-element partial order and is closed under the series and parallel composition operations.
Any partial order may be represented(usually in more than one way) by a directed acyclic graph in which there is a path from x to y whenever x and y are elements of the partial order with x≤ y.
A deep result by Neil Robertson andPaul Seymour states that this partial order is actually a well-quasi-ordering: if an infinite list G1, G2,… of finite graphs is given, then there always exist two indices i< j such that Gi is a minor of Gj.