2

Last updated

← 1 2 3 →
−1 0 1 2 3 4 5 6 7 8 9 →
Cardinal two
Ordinal 2nd (second / twoth)
Numeral system binary
Factorization prime
Gaussian integer factorization
Prime 1st
Divisors 1, 2
Greek numeral Β´
Roman numeral II, ii
Greek prefix di-
Latin prefix duo-/bi-
Old English prefix twi-
Binary 102
Ternary 23
Senary 26
Octal 28
Duodecimal 212
Hexadecimal 216
Greek numeral β'
Arabic, Kurdish, Persian, Sindhi, Urdu ٢
Ge'ez ፪
Bengali ২
Chinese numeral 二，弍，貳
Devanāgarī २
Telugu ౨
Tamil ௨
Kannada ೨
Hebrew ב
Armenian Բ
Khmer ២
Maya numerals ••
Thai ๒
Georgian Ⴁ/ⴁ/ბ(Bani)
Malayalam ൨
Babylonian numeral 𒐖
Egyptian hieroglyph, Aegean numeral, Chinese counting rod ||
Morse code .._ _ _

2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number.

Contents

Because it forms the basis of a duality, it has religious and spiritual significance in many cultures.

As a word

Two is most commonly a determiner used with plural countable nouns, as in two days or I'll take these two. [1] Two is a noun when it refers to the number two as in two plus two is four.

Etymology of two

The word two is derived from the Old English words twā (feminine), tū (neuter), and twēġen (masculine, which survives today in the form twain). [2]

The pronunciation /tuː/, like that of who is due to the labialization of the vowel by the w, which then disappeared before the related sound. The successive stages of pronunciation for the Old English twā would thus be /twɑː/, /twɔː/, /twoː/, /twuː/, and finally /tuː/. [2]

Mathematics

An integer is determined to be even if it is divisible by two. When written in base 10, all multiples of 2 will end in 0, 2, 4, 6, or 8. [3] 2 is the smallest and the only even prime number, and the first Ramanujan prime. [4]

Geometry

A digon is a polygon with two sides (or edges) and two vertices. [5] : 52  Two distinct points in a plane are always sufficient to define a unique line in a nontrivial Euclidean space. [6]

Set theory

A set that is a field has a minimum of two elements. [7] A Cantor space is a topological space homeomorphic to the Cantor set.[ citation needed ]

Base 2

Binary is a number system with a base of two, it is used extensively in computing. [8]

List of basic calculations

Multiplication 1234567891011121314151617181920212223242550100
2 × x2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 100 200
Division 1234567891011121314151617181920
2 ÷ x2 1 0.60.50.40.30.2857140.250.20.20.180.160.1538460.1428570.130.1250.11764705882352940.10.1052631578947368420.1
x ÷ 2 0.5 1.522.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
Exponentiation 1234567891011121314151617181920
2x2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 1638432768 65536 1310722621445242881048576
x2 1 9 25 36 49 64 81 100 121 144 169 196 225 256 289 324 361 400

Evolution of the Arabic digit

Evolution2glyph.png

The digit used in the modern Western world to represent the number 2 traces its roots back to the Indic Brahmic script, where "2" was written as two horizontal lines. The modern Chinese and Japanese languages (and Korean Hanja) still use this method. The Gupta script rotated the two lines 45 degrees, making them diagonal. The top line was sometimes also shortened and had its bottom end curve towards the center of the bottom line. In the Nagari script, the top line was written more like a curve connecting to the bottom line. In the Arabic Ghubar writing, the bottom line was completely vertical, and the digit looked like a dotless closing question mark. Restoring the bottom line to its original horizontal position, but keeping the top line as a curve that connects to the bottom line leads to our modern digit. [9]

In fonts with text figures, digit 2 usually is of x-height, for example, Text figures 256.svg .[ citation needed ]

In science

See also

Related Research Articles

15 (fifteen) is the natural number following 14 and preceding 16.

19 (nineteen) is the natural number following 18 and preceding 20. It is a prime number.

23 (twenty-three) is the natural number following 22 and preceding 24.

84 (eighty-four) is the natural number following 83 and preceding 85. It is seven dozens.

73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled out name.

68 (sixty-eight) is the natural number following 67 and preceding 69. It is an even number.

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.

600 is the natural number following 599 and preceding 601.

It is:

3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.

4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.

151 is a natural number. It follows 150 and precedes 152.

<span class="mw-page-title-main">1,000,000</span> Natural number

1,000,000, or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one.

100,000 (one hundred thousand) is the natural number following 99,999 and preceding 100,001. In scientific notation, it is written as 105.

10,000,000 is the natural number following 9,999,999 and preceding 10,000,001.

100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.

233 is the natural number following 232 and preceding 234.

1728 is the natural number following 1727 and preceding 1729. It is a dozen gross, or one great gross. It is also the number of cubic inches in a cubic foot.

189 is the natural number following 188 and preceding 190.

228 is the natural number following 227 and preceding 229.

References

  1. ↑ Huddleston, Rodney D.; Pullum, Geoffrey K.; Reynolds, Brett (2022). A student's introduction to English grammar (2nd ed.). Cambridge, United Kingdom: Cambridge University Press. p. 117. ISBN   978-1-316-51464-1. OCLC   1255524478.
  2. 1 2 "two, adj., n., and adv." . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
  3. ↑ Sloane, N. J. A. (ed.). "SequenceA005843(The nonnegative even numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-12-15.
  4. ↑ "Sloane's A104272 : Ramanujan primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Archived from the original on 2011-04-28. Retrieved 2016-06-01.
  5. ↑ Wilson, Robin (2014). Four Colors Suffice (Revised color ed.). Princeton University Press. ISBN   978-0-691-15822-8.
  6. ↑ Carrell, Jim. "Chapter 1 | Euclidean Spaces and Their Geometry". MATH 307 Applied Linear Algebra (PDF).
  7. ↑ "Field Contains at least 2 Elements".
  8. ↑ "How computers see the world - Binary - KS3 Computer Science Revision". BBC Bitesize. Retrieved 2024-06-05.
  9. ↑ Georges Ifrah, The Universal History of Numbers: From Prehistory to the Invention of the Computer transl. David Bellos et al. London: The Harvill Press (1998): 393, Fig. 24.62
  10. ↑ "Double-stranded DNA". Scitable. Nature Education. Archived from the original on 2020-07-24. Retrieved 2019-12-22.
  11. ↑ "The Complete Explanation of the Nuclear Magic Numbers Which Indicate the Filling of Nucleonic Shells and the Revelation of Special Numbers Indicating the Filling of Subshells Within Those Shells". www.sjsu.edu. Archived from the original on 2019-12-02. Retrieved 2019-12-22.
  12. ↑ Bezdenezhnyi, V. P. (2004). "Nuclear Isotopes and Magic Numbers". Odessa Astronomical Publications. 17: 11. Bibcode:2004OAP....17...11B.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.