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A Langford pairing for n = 4. In combinatorial mathematics, a Langford pairing, also called a Langford sequence, is a permutation of the sequence of 2 n numbers 1, 1, 2, 2, ..., n, n in which the two 1s are one unit apart, the two 2s are two units apart, and more generally the two copies of each number k are k units apart.
The problem for graphs is NP-complete if the edge lengths are assumed integers. The problem for points on the plane is NP-complete with the discretized Euclidean metric and rectilinear metric. The problem is known to be NP-hard with the (non-discretized) Euclidean metric. [3] : . ND22, ND23. Vehicle routing problem.
Bag-of-words model. The bag-of-words model is a model of text which uses a representation of text that is based on an unordered collection (or "bag") of words. It is used in natural language processing and information retrieval (IR). It disregards word order (and thus any non-trivial notion of grammar [clarification needed]) but captures ...
A twisted pair can be used as a balanced line, which as part of a balanced circuit can greatly reduce the effect of noise currents induced on the line by coupling of electric or magnetic fields. The idea is that the currents induced in each of the two wires are very nearly equal. The twisting ensures that the two wires are on average the same ...
Stable marriage problem. In mathematics, economics, and computer science, the stable marriage problem (also stable matching problem) is the problem of finding a stable matching between two equally sized sets of elements given an ordering of preferences for each element. A matching is a bijection from the elements of one set to the elements of ...
In an asymmetric pair, the words differ in number of syllables. Each pair is in a subsection according to the respective numbers of syllables in the words when they are in alphabetical order. Disyllabic-and-monosyllabic pairs Disyllabic-and-trisyllabic pairs. cerement, endearment; crucial, fiducial; digest (noun), obligest
See List of English words of Welsh origin a list which includes Cornish (e.g. coracle; crag; corgi (type of dog), likely flannel; likely gull (type of bird), iron, lawn, wrasse (type of fish)) See Gaelic (e.g. keening, bog, bother, hubbub, glen, clan) See Breton (chiefly local terms in archaeology: dolmen, menhir)
Hints About Today's NYT Connections Categories on Saturday, June 15. 1. Related to a certain sport. 2. Related to a certain animal. 3. What might be mentioned when talking about hair. 4. They can ...