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| {{wikipediainfo|1}}{{dab page|One}}
| | '''Sensill''' was a number that translated in to [[English (language)|English]] as the number [[1 (number)|1]. It was part of the language utilised by the [[Captain (Wild Blue Yonder)|captain]]'s spaceship that was drifting at the [[edge of the universe]]. The [[Fourteenth Doctor]] did not know what language it was part of, therefore did not know what the word meant. However, he did read it and did translate it as the number 1 when read in conjunction with the ship's base codes. By doing so, he could read the data logs and control parts of the ship, having deciphered enough of the language to do so. ([[TV]]: {{cs|Wild Blue Yonder (TV story)}}) |
| '''1''' was a [[prime number]]. ([[AUDIO]]: ''[[The Haunting (audio story)|The Haunting]]'') | | [[Category:Numbers]] |
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| According to the [[Tenth Doctor]], "any number that reduce[d] to 1 when you [took] the [[sum]] of the [[square (algebra)|square]] of its [[digit]]s and continue[d] iterating it until it yield[ed] 1" was a [[happy number]]. ([[TV]]: ''[[42 (TV story)|42]]'')
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| [[File:Calculus demonstration 1.jpg|thumb|Part of the [[Mathematical proof|demonstration]] made by the [[Twelfth Doctor]]. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')]]
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| The [[Twelfth Doctor]] once [[Mathematics|proved]] that <math>\lim_{\theta\to 0} \frac {sin \theta} {\theta} = 1</math>. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')
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| [[Block Transfer Computation]] made use of 1s and [[0 (number)|0s]], as it was written in [[binary]]. ([[AUDIO]]: ''[[The Enchantress of Numbers (audio story)|The Enchantress of Numbers]]'')
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| According to the [[Second Doctor]], a one in [[13 (number)|13]] chance was about [[7.6923 (number)|7.6923]] [[percentage|percent]], [[odds]] he didn't like. ([[COMIC]]: ''[[Card Conundrum (comic story)|Card Conundrum]]'')
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| The [[Tenth Doctor]] believed that [[Dalek Caan]], who had emerged as the last of the [[Cult of Skaro]], was the one remaining [[Dalek]] in "[[the universe|the whole universe]]". ([[TV]]: ''[[Evolution of the Daleks (TV story)|Evolution of the Daleks]]'')
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| The Twelfth Doctor once told [[Bill Potts|Bill]] that "[[11 (number)|eleven]] [[addition|plus]] [[2 (number)|two]]" was an [[anagram]] of "[[12 (number)|twelve]] plus one", to which Bill responded that both of these were equal to [[13 (number)|13]]. ([[COMIC]]: ''[[Harvest of the Daleks (comic story)|Harvest of the Daleks]]'')
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| [[British Summertime]] began in early [[2005]] on a [[Sunday]] [[morning]] at 01:00[[A.M.|am]] when [[Daylight savings|the clocks went forwards]]. ([[PROSE]]: ''[[The Clocks Go Forward (short story)|The Clocks Go Forward]]'')
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| The [[countdown]] towards the [[Ninth Doctor]]'s [[eviction]] on ''[[Big Brother]]'' [[Counting|counted]] from [[6 (number)|6]] to 0, going through [[5 (number)|5]], [[4 (number)|4]], [[3 (number)|3]], [[2 (number)|2]], and 1. ([[TV]]: ''[[Bad Wolf (TV story)|Bad Wolf]]'')
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| [[File:1 finger.jpg|left|thumb|The [[Thirteenth Doctor]] holds up 1 [[finger]] in reference to the [[number]], '1'. ([[WC]]: ''[[Message from the Doctor (webcast)|Message from the Doctor]]'')]]
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| In an [[Emergency transmission (Message from the Doctor)|emergency transmission]] sent by [[The Doctor's TARDIS|the TARDIS]], the [[Thirteenth Doctor]] listed 5 things that she did in any worrying [[situation]]. The first was [[Memory|remembering]] that she would get through the situation, and that [[darkness]] never prevailed. ([[WC]]: [[Message from the Doctor (webcast)|Message from the Doctor]])
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| == Behind the scenes ==
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| Though [[AUDIO]]: ''[[The Haunting (audio story)|The Haunting]]'' establishes that 1 is itself considered a prime number in the [[DWU]], this is a point of contention among mathematicians. There was significant disagreement as to whether to classify 1 as a prime number in the story's time period of the [[1890s]]. In particular, the entry for ''Number'' published in 1890 in the 9th edition of ''[[Encyclopædia Britannica]]'' stated that every positive number was either prime or composite, and explicitly listed 1 as prime.<ref>A. Reddick ''et al''. The History of the Primality of One---A Selection of Sources. Accessed at http://primes.utm.edu/notes/one.pdf on 7.12.2015.</ref> Nowadays, in the 21st century, 1 is instead generally considered as neither prime nor composite. To further complicate real-world existence of 1 as a number, there have even been periods of time - like Ancient Greek era - where 1 was in fact ''not even considered a number''.<ref>[https://books.google.co.uk/books?id=cUPXqSb7V1wC&pg=PA35&redir_esc=y#v=onepage&q&f=false Speusippus of Athens: A Critical Study With a Collection of the Related Texts and Commentary, Leonardo Tarán, 1981] (pgs 34-38)</ref> This included notable mathematicians like Aristotle and Euclid.<ref>"What is the smallest Prime?", Chris K. Caldwell & Yeng Xiong; published in Journal of Integer Sequences Vol. 15 (2012)</ref>
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| Though unremarked in [[PROSE]]: ''[[Daisy Chain (short story)|Daisy Chain]]'', 1 is also the first and second [[Fibonacci number]].
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| == Footnotes ==
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| {{reflist}}
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| [[Category:Prime numbers|N 0001]] | |
