3 (عدد)

← 2 3 4 →
−1 0 1 2 3 4 5 6 7 8 9
كميخطأ: الوظيفة "numeral_to_arabic" غير موجودة.
ترتيبي3rd
(خطأ: الوظيفة "numeral_to_arabic" غير موجودة.)
نظام العدternary
التحليل لعواملprime
أولي2nd
القواسم1, 3
العدد اليونانيΓ´
العدد الرومانيIII, iii
السابقة اليونانيةtri-
السابقة اللاتينيةtre-/ter-
ثنائي112
ثلاثي103
رباعي34
خماسي35
سداسي36
ثماني38
اثنا عشري312
ستة عشري316
عشريني320
أساس 36336
Arabic, Kurdish, Persian, Sindhi, Urdu٣
Bengali, Assamese
Chinese三,弎,叄
Devanāgarī
Ge'ez
Greekγ (or Γ)
Hebrewג
Japanese三/参
Khmer
Malayalam
Tamil
Telugu
Kannada
Thai
N'Ko߃
Lao
GeorgianႢ/ⴂ/გ (Gani)

3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious or cultural significance in many societies.

3 (ثلاثة) هو عدد طبيعي يلي العدد 2 ويسبق العدد 4 .

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Mathematics

3 is:

  • a rough approximation of π (3.1415...) and a very rough approximation of e (2.71828..) when doing quick estimates.
  • the number of non-collinear points needed to determine a plane and a circle.
  • the first odd prime number and the second smallest prime.
  • the first Fermat prime (22n + 1).
  • the first Mersenne prime (2n − 1).
  • the second Sophie Germain prime.
  • the second Mersenne prime exponent.
  • the second factorial prime (2! + 1).
  • the second Lucas prime.
  • the second triangular number. It is the only prime triangular number.
  • the fourth unique Fibonacci number and the fifth in the sequence.
  • the smallest number of sides that a simple (non-self-intersecting) polygon can have.
  • the only known number n such that n!-1 and n!+1 are prime.

Three is the only prime which is one less than a perfect square. Any other number which is n2 − 1 for some integer n is not prime, since it is (n − 1)(n + 1). This is true for 3 as well (with n = 2), but in this case the smaller factor is 1. If n is greater than 2, both n − 1 and n + 1 are greater than 1 so their product is not prime.


Numeral systems

There is some evidence to suggest that early man may have used counting systems which consisted of "One, Two, Three" and thereafter "Many" to describe counting limits. Early peoples had a word to describe the quantities of one, two, and three but any quantity beyond was simply denoted as "Many". This is most likely based on the prevalence of this phenomenon among people in such disparate regions as the deep Amazon and Borneo jungles, where western civilization's explorers have historical records of their first encounters with these indigenous people.[1]

List of basic calculations

Multiplication 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 50 100 1000 10000
3 × x 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 150 300 3000 30000
Division 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
3 ÷ x 3 1.5 1 0.75 0.6 0.5 0.428571 0.375 0.3 0.3 0.27 0.25 0.230769 0.2142857 0.2 0.1875 0.17647058823529411 0.16 0.157894736842105263 0.15
x ÷ 3 0.3 0.6 1 1.3 1.6 2 2.3 2.6 3 3.3 3.6 4 4.3 4.6 5 5.3 5.6 6 6.3 6.6
Exponentiation 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
3x 3 9 27 81 243 729 2187 6561 19683 59049 177147 531441 1594323 4782969 14348907 43046721 129140163 387420489 1162261467 3486784401
x3 1 8 27 64 125 216 343 512 729 1000 1331 1728 2197 2744 3375 4096 4913 5832 6859 8000

Science

Protoscience


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Pseudoscience

  • Three is the symbolic representation for Mu, Augustus Le Plongeon's and James Churchward's lost continent.[5]
  • In Pythagorean numerology the number 3 is the digit that represents the communication. It encourages the expansion of creativity, sociability between people and movement.

Philosophy

مقال رئيسي: Trichotomy (philosophy)

Religion

Many world religions contain triple deities or concepts of trinity, including:

The Shield of the Trinity is a diagram of the Christian doctrine of the Trinity

Christianity

Judaism

Buddhism

  • The Triple Bodhi (ways to understand the end of birth) are Budhu, Pasebudhu, and Mahaarahath.
  • The Three Jewels, the three things that Buddhists take refuge in.


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Shinto

Daoism

Hinduism

Zoroastrianism

  • The three virtues of Humata, Hukhta and Huvarshta (Good Thoughts, Good Words and Good Deeds) are a basic tenet in Zoroastrianism.

Norse mythology

Three is a very significant number in Norse mythology, along with its powers 9 and 27.

  • Prior to Ragnarök, there will be three hard winters without an intervening summer, the Fimbulwinter.
  • Odin endured three hardships upon the World Tree in his quest for the runes: he hanged himself, wounded himself with a spear, and suffered from hunger and thirst.
  • Bor had three sons, Odin, Vili, and .

Other religions

Esoteric tradition

As a lucky or unlucky number

Three (, formal writing: , pinyin sān, Cantonese: saam1) is considered a good number in Chinese culture because it sounds like the word "alive" ( pinyin shēng, Cantonese: saang1), compared to four (, pinyin: , Cantonese: sei1), which sounds like the word "death" ( pinyin , Cantonese: sei2).

Counting to three is common in situations where a group of people wish to perform an action in synchrony: Now, on the count of three, everybody pull! Assuming the counter is proceeding at a uniform rate, the first two counts are necessary to establish the rate, and the count of "three" is predicted based on the timing of the "one" and "two" before it. Three is likely used instead of some other number because it requires the minimal amount counts while setting a rate.

There is another superstition that it is unlucky to take a third light, that is, to be the third person to light a cigarette from the same match or lighter. This superstition is sometimes asserted to have originated among soldiers in the trenches of the First World War when a sniper might see the first light, take aim on the second and fire on the third.[بحاجة لمصدر]

The phrase "Third time's the charm" refers to the superstition that after two failures in any endeavor, a third attempt is more likely to succeed. This is also sometimes seen in reverse, as in "third man [to do something, presumably forbidden] gets caught".[بحاجة لمصدر]

Luck, especially bad luck, is often said to "come in threes".[17]

Sports

  • In American and Canadian football, a field goal is worth three points.
  • In association football:
    • For purposes of league standings, since the mid-1990s almost all leagues have awarded three points for a win.
    • A team that wins three trophies in a season is said to have won a treble.
    • A player who scores three goals in a match is said to have scored a hat-trick.
  • In baseball:
    • A batter strikes out upon the third strike in any single batting appearance.
    • Each team's half of an inning ends once the defense has recorded three outs (unless the home team has a walk-off hit in the ninth inning or any extra inning).
    • In scorekeeping, "3" denotes the first baseman.
  • In basketball:
  • In bowling, three strikes bowled consecutively is known as a "turkey".
  • In cricket, a bowler who is credited with dismissals of batsmen on three consecutive deliveries has achieved a "hat-trick".
  • In Gaelic games (Gaelic football for men and women, hurling, and camogie), three points are awarded for a goal, scored when the ball passes underneath the crossbar and between the goal posts.
  • In ice hockey:
    • Scoring three goals is called a "hat trick" (usually not hyphenated in North America).
    • A team will typically have three forwards on the ice at any given time.
  • In professional wrestling, a pin is when one holds the opponent's shoulders against the mat for a count of three.
  • In rugby union:
  • In rugby league:
    • One of the two starting centres wears the jersey number 3. (An exception to this rule is the Super League, which uses static squad numbering.)
  • A "threepeat" is a term for winning three consecutive championships.
  • A triathlon consists of three events: swimming, bicycling, and running.
  • In many sports a competitor or team is said to win a Triple Crown if they win three particularly prestigious competitions.
  • In volleyball, once the ball is served, teams are allowed to touch the ball three times before being required to return the ball to the other side of the court, with the definition of "touch" being slightly different between indoor and beach volleyball.

Film

See also

References

  1. ^ Gribbin, Mary; Gribbin, John R.; Edney, Ralph; Halliday, Nicholas (2003). Big numbers. Cambridge: Wizard. ISBN 1840464313.
  2. ^ "Most stable shape- triangle". Maths in the city. Retrieved February 23, 2015.
  3. ^ Eric John Holmyard. Alchemy. 1995. p.153
  4. ^ Walter J. Friedlander. The golden wand of medicine: a history of the caduceus symbol in medicine. 1992. p.76-77
  5. ^ Churchward, James (1931). "The Lost Continent of Mu – Symbols, Vignettes, Tableaux and Diagrams". Biblioteca Pleyades. Retrieved 2016-03-15.
  6. ^ "HUG 31, ff. 017r-v, inc. CF ad CE = CF ad CV". Codices Hugeniani Online. doi:10.1163/2468-0303-cohu_31-015.
  7. ^ "Encyclopaedia Britannica". Lexikon des Gesamten Buchwesens Online (in الألمانية). doi:10.1163/9789004337862_lgbo_com_050367.
  8. ^ T. E. T. (25 January 1877). "The Encyclopaedia Britannica". Nature. XV (378): 269–271.
  9. ^ Marcus, Rabbi Yossi (2015). "Why are many things in Judaism done three times?". Ask Moses. Retrieved 16 March 2015.
  10. ^ "Shabbat". Judaism 101. 2011. Retrieved 16 March 2015.
  11. ^ Kitov, Eliyahu (2015). "The Three Matzot". Chabad.org. Retrieved 16 March 2015.
  12. ^ Kaplan, Rabbi Aryeh (28 August 2004). "Judaism and Martyrdom". Aish.com. Retrieved 16 March 2015.
  13. ^ "The Basics of the Upsherin: A Boy's First Haircut". Chabad.org. 2015. Retrieved 16 March 2015.
  14. ^ "The Conversion Process". Center for Conversion to Judaism. Retrieved 16 March 2015.
  15. ^ Kaplan, Aryeh. "The Soul". Aish. From The Handbook of Jewish Thought (Vol. 2, Maznaim Publishing. Reprinted with permission.) September 4, 2004. Retrieved February 24, 2015.
  16. ^ James G. Lochtefeld, Guna, in The Illustrated Encyclopedia of Hinduism: A-M, Vol. 1, Rosen Publishing, ISBN 978-0-8239-3179-8, page 265
  17. ^ See "bad" in the Oxford Dictionary of Phrase and Fable, 2006, via Encyclopedia.com.

وصلات خارجية

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ابحث عن three في
قاموس المعرفة.