Disjunctive sequence
A disjunctive sequence is an infinite sequence (over a finite alphabet of characters) in which every finite string appears as a substring. For instance, the binary Champernowne sequence
formed by concatenating all binary strings in shortlex order, clearly contains all the binary strings and so is disjunctive. (The spaces above are not significant and are present solely to make clear the boundaries between strings). The complexity function of a disjunctive sequence S over an alphabet of size k is pS(n) = kn.
Any normal sequence (a sequence in which each string of equal length appears with equal frequency) is disjunctive, but the converse is not true. For example, letting 0n denote the string of length n consisting of all 0s, consider the sequence
obtained by splicing exponentially long strings of 0s into the shortlex ordering of all binary strings. Most of this sequence consists of long runs of 0s, and so it is not normal, but it is still disjunctive.
A disjunctive sequence is recurrent but never uniformly recurrent/almost periodic.
Lexicon (disambiguation)
The lexicon of a language is its vocabulary.
Lexicon is also a synonym for a dictionary or encyclopedic dictionary, and may also refer to:
See also
Head (watercraft)
The head (or heads) is a ship's toilet. The name derives from sailing ships in which the toilet area for the regular sailors was placed at the head or bow of the ship.
Design
In sailing ships, the toilet was placed in the bow for two reasons. Firstly, since most vessels of the era could not sail directly into the wind, the winds came mostly across the rear of the ship, placing the head essentially downwind. Secondly, if placed somewhat above the water line, vents or slots cut near the floor level would allow normal wave action to wash out the facility. Only the captain had a private toilet near his quarters, at the stern of the ship in the quarter gallery.
In many modern boats, the heads look similar to seated flush toilets but use a system of valves and pumps that brings sea water into the toilet and pumps the waste out through the hull in place of the more normal cistern and plumbing trap to a drain. In small boats the pump is often hand operated. The cleaning mechanism is easily blocked if too much toilet paper or other fibrous material is put down the pan.
News style
News style, journalistic style or news writing style is the prose style used for news reporting in media such as newspapers, radio and television.
News style encompasses not only vocabulary and sentence structure, but also the way in which stories present the information in terms of relative importance, tone, and intended audience. The tense used for news style articles is past tense.
News writing attempts to answer all the basic questions about any particular event—who, what, when, where and why (the Five Ws) and also often how—at the opening of the article. This form of structure is sometimes called the "inverted pyramid", to refer to the decreasing importance of information in subsequent paragraphs.
News stories also contain at least one of the following important characteristics relative to the intended audience: proximity, prominence, timeliness, human interest, oddity, or consequence.
The related term journalese is sometimes used, usually pejoratively, to refer to news-style writing. Another is headlinese.
Head (Julian Cope song)
"Head" is a song by the English singer-songwriter Julian Cope. It is the third and final single released in support of his album Peggy Suicide.
Chart positions
References
Nike
Nike may refer to:
- The Nike of Samothrace, an ancient statue of the goddess Nike
- MIM-14 Nike-Hercules, solid fuel propelled surface-to-air missile
- Nike (rocket stage)
- Various U.S. sounding rockets named after the upper stage used, including:
Nike (rocket stage)
The Nike stage or Nike booster, a solid fuel rocket motor, was created by the predecessor of Thiokol.
It was initially developed for use as the first stage of the Nike Ajax and Nike Hercules missiles as part of Project Nike.
Subsequently it was employed in a variety of missiles and sounding rockets, becoming one of the most popular and reliable rocket stages, not only in the United States, but also in several other countries around the world.
