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Twin prime (3802 bytes)
1: ... primes; an alternative name for this is '''prime twin'''.) 3: ... a distribution law for twin primes akin to the [[prime number theorem]]. 5: ...ark contrast to the sum of the reciprocals of all primes, which diverges. 6: ...hat differs by m from a number having at most two prime factors. 7: (Before Brun attacked the twin prime problem, [[Jean Merlin]] had also attempted to so... Twin prime conjecture (4540 bytes) 1: ...mous problem in [[number theory]] that involves [[prime number]]s. It states: 4: ...rimes ''p'' such that ''p'' + 2 is also prime. 7: Such a pair of prime numbers is called a [[twin prime]]. 9: ...oning involving the probabilistic distribution of primes. 11: ... 2''k''. The case ''k'' = 1 is the twin prime conjecture. Twin-to-twin transfusion syndrome (2242 bytes) 1: ...(TOPS)) is a disorder that can affect identical [[twin]] or higher [[multiple birth|multiple]] [[pregnan... 3: ...e "recipient"). The transfusion causes the donor twin to have decreased blood volume, retarding the don... 7: Other than requiring a monochorionic twin (or higher multiple) pregnancy, the causes of TTT... 12: *[[Vanishing twin]] 15: *[http://www.tttsfoundation.org/ The Twin to Twin Transfusion Syndrome Foundation] V-twin (1031 bytes) 1: [[Image:Honda_v-twin.jpg|right|thumb|Honda 90° V-twin]] 3: A '''V-twin''' is a two cylinder [[internal combustion engine... 5: ... recent Japanese motorcycles. The longitudinal V-twin as seen on [[Moto-Guzzi]]s and some [[Honda]]s is... 7: The most obvious configuration for a V-twin is a 90° angle, but others angle can be seen like... 9: ...tive to the [[flat-twin]] configuration. The flat-twin is perfectly balanced. Twin (10327 bytes) 1: ...Image:TwinBoysInBathtub.jpg|thumb|250px|Fraternal twin boys in the tub]] 4: ...his article is limited to this usage of the term "twin". 6: ==Types of twins== 7: ===Fraternal twins=== 9: ...ther. The two eggs form two zygotes, and these twins are therefore also known as '''dizygotic'''. Parasitic twin (1959 bytes) 1: ...healthy, otherwise mostly fully-formed individual twin. They are defined as [[parasite|parasitic]], rath... 3: Conjoined-parasitic twins united at the head are described as [[craniopagu... 5: ==Specific types of parasitic twin== 7: ...olves a [[fetus]] getting trapped inside of its [[twin]]. It continues to survive as a parasite even pa... 9: ===Acardiac twin=== Flat-twin (1617 bytes) 1: ...m; text-align:center; width:241px; ">[[Image:Flat-twin.jpg]]<br> 2: ''[[BMW]] motorcycle powered by a flat-twin engine''</div> 4: A '''flat-twin''' is a two cylinder [[internal combustion engine... 8: Most of the flat-twin engines built are air cooled. 10: ...e ground in turns. In practice a longitudinal [[V-twin]] like on [[Moto-Guzzi]] will give a lower [[cent... Straight-twin (1713 bytes) 1: A '''straight-twin engine''' is a [[two]] cylinder [[piston]] engine... 3: ... cars. No current production car uses a straight-twin; even the smallest [[engine displacement|displace... 5: ...ost of the British [[four-stroke cycle]] straight-twin engines had a crank angle of 360°, which means th... 11: ...[Ferrari]] briefly considered creating a straight-twin engine for [[Formula One]] use in the [[1950s]]. ... Twin Cobra (757 bytes) 1: ...AME}}.png|thumb|Screenshot ''{{PAGENAME}}'']]'''''Twin Cobra''''' is a two player helicopter scrolling s... 4: *[http://www.toaplan.com/twincobra Twin Cobra at Toaplan.com] (unofficial information sou... Evil twin (4088 bytes) 1: An '''evil twin''' is the concept in [[fiction]] (especially [[sc... 3: ...the characters in the regular universe (and "good twins" of evil people). 5: ... [[time travel]] offer more opportunities for the twin to arise and their tendency to become exact polar... 7: ...e of their twin. In film and television the evil twin usually offers an actor the chance to play the sa... 10: The similarities and differences of twins has long held a fascination for writers. Perhap... Aphex Twin (7712 bytes) 1: ...james.jpg|right|thumb|Richard D. James, aka Aphex Twin]] 3: [[Aphex Twin]] (born '''Richard David James''', [[August 18]],... 7: ...er of signal processing equipment with the word ''twin'' in reference to an older brother (also called R... 11: The music of Aphex Twin ranges over many different genres within the enco... 13: ...n artwork direction for many of his albums. Aphex Twin continues to create records at the boundaries of ... Twin cam (231 bytes) 1: Twin-cam is a colloquial term for [[combustion]] [[eng... Twin cities (11398 bytes) 1: '''Twin cities''' are either: 5: ...ee [[sister cities]] ([[United States|US]]) and [[twin towns]] ([[Europe]]) 7: ...nnesota]]. (Although the metropolitan area of the Twin Cities actually includes seven counties and nearl... 9: ...win cities are often separated by a river — twin cities without this physical barrier more often b... 11: Twin cities often share an [[airport]], into whose [[I... Twin paradox (6265 bytes) 1: ...Earth, it is observed that he is younger than the twin who stayed put. Or, as first stated by [[Albert ... 7: ...f, contrary to that brother's expectations. Which twin is correct? 9: ...re able to distinguish himself from the traveling twin. 11: ...when he must adjust the ''calculated'' age of the twin at rest. This is a purely artificial effect cause... 14: ...aradox_diagram.png|Spacetime diagram of traveling twins]] Twin Peaks (13876 bytes) 1: ...levision series. For alternative meanings, see: [[Twin Peaks (disambiguation)]].'' 3: '''''Twin Peaks''''' was an American [[television program|t... 9: ...cal girl, [[Laura Palmer]] among the town folk of Twin Peaks. The program portrays small-town [[United ... 11: ...nch's other work (such as ''[[Blue Velvet]]''), ''Twin Peaks'' explores the relationship between the ven... 30: ...complimented the otherworldliness that typified ''Twin Peaks'' during its run. Twin Sisters (415 bytes) 1: '''''Twin Sisters''''' ([[Dutch language|Dutch]]: ''De Twee... 3: Twin Sisters is also the name of film adaped from the ... Twin Towers (1634 bytes) 1: The phrase '''Twin Towers''' has different connotations for readers ... 4: ...[skyscraper]] complexes are referred to as the '''Twin Towers''': 7: *the [[Petronas Twin Towers]] in [[Kuala Lumpur]]; and 10: ...] in [[London]], [[England]] was renowned for its Twin Towers, which stood at the stadium's entrance for... 12: The [[Twin Towers Correctional Facility]] is the largest [[j... Twin study (2512 bytes) 1: ...nmental factors. By examining the degree to which twins are differentiated, a study may determine the ex... 3: ...mental factors from genetic factors. For example, twins that are "raised apart" are still often raised i... 5: ...he presence of a similar disease [[phenotype]] in twins) which can give markedly different results. 9: For a group of twins in which at least one member of each pair is aff... 11: For example, a group of 10 twins have been pre-selected to have one affected memb... F-82 Twin Mustang (2324 bytes) 3: The '''F-82 Twin Mustang''' was a long-range escort [[Fighter air... 5: ...Image:F82 twin mustang.jpg|thumb|300px|right|F-82 Twin Mustang in flight]] 9: ... (C and G variants) radar. It was a night fighter Twin Mustang that shot down the first [[MiG-15]] jet t... 53: *[[Heinkel He 111|Heinkel He 111Z]] - another "twinned" aircraft Twin Ports (1481 bytes) 1: The '''Twin Ports''' of [[Duluth, Minnesota]] and [[Superior,... 10: *[[Twin cities]] (the generic term) 11: *[[Minneapolis-St. Paul]] (the Twin Cities of [[Minnesota]])
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