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In combinatorics on words, Fine and Wilf's theorem is a fundamental result describing what happens when a long-enough word has two different periods (i.e., distances at which its letters repeat). [ 1 ] [ 2 ] Informally, the conclusion is that such words w {\displaystyle w} have also a third, shorter period.
The author adds the caveat that in certain instances a writer may want to use two spaces between sentences. The examples given are: when one space "may not provide a clear visual break between sentences", if an abbreviation is used at the end of a sentence, or when some very small proportional fonts (such as 10-point Times New Roman) are used.
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A major sentence is a regular sentence; it has a subject and a predicate, e.g. "I have a ball." In this sentence, one can change the persons, e.g. "We have a ball." However, a minor sentence is an irregular type of sentence that does not contain a main clause, e.g. "Mary!", "Precisely so.", "Next Tuesday evening after it gets dark."
A few languages have specific parts of speech that distinguish between two number categories: one or two, and more than two. The former category can be thought of as a single conflated singular-dual number. [257] For example, in the nouns of Kalaw Lagaw Ya: [258] [259] ùmay - "dog(s)" (one or two) ùmayl - "dogs" (plural, three or more)
Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic , bifurcated , or bimodal ) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]
There has been some controversy regarding the proper amount of sentence spacing in typeset material. The Elements of Typographic Style states that only a single word space is required for sentence spacing. [21] Psychological studies suggest "readers benefit from having two spaces after periods." [22]
With the introduction of the typewriter in the late 19th century, typists used two spaces between sentences to mimic the style used by traditional typesetters. [4] While wide sentence spacing was phased out in the printing industry in the mid-20th century, the practice continued on typewriters [5] and later on computers. [6]