septua- (from Latin)
7 (seven) is a number, numeral, and also glyph that represents the number. It is the organic number<1> that adheres to 6 and precedes 8. That is an integer and also a cardinal number, the is, a number the is used for counting.
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<2> In addition, that is classified as a genuine number,<3> separating it from imaginary numbers.
2 In mathematics3 In science5 In religion
Seven days of production - 1765 book, title page
Evolution that the glyph
In the beginning, assorted Hindus composed 7 an ext or much less in one stroke as a curve the looks choose an uppercase J upside down. The main contribution that the western Ghubar Arabs to be to make the longer line diagonal quite than straight, despite they verified some tendencies to making the character more rectilinear. The east Arabs arisen the character from a 6-look-alike into an uppercase V-look-alike. Both modern Arab forms influenced the europe form, a two-stroke personality consisting the a horizontal top line join at its best to a heat going down to the bottom left corner, a line the is slightly curved in some font variants.
As to be the instance with the europe glyph, the Cham and also Khmer glyph for 7 likewise evolved come look favor their glyph for 1, despite in a various way, for this reason they were additionally concerned around making your 7 an ext different. For the Khmer, this regularly involved including a horizontal line above the glyph.<4> This is analogous to the horizontal stroke with the center that is periodically used in handwriting in the west world, yet it is virtually never supplied in computer system fonts. This horizontal punch is, however, vital to identify the glyph for seven from the glyph because that one in works that usage a lengthy upstroke in the glyph because that one.
On the seven-segment displays of pocket calculators and digital watches, 7 is the number with the most typical glyph sports (0, 6 and 9 additionally have variant glyphs). Most calculators use 3 line segments, yet in part brands that calculators, 7 is composed with 4 line segments. The factor is that in Japan and also Korea, 7 is created as ① in the illustration to the right.
While the shape of the 7 character has actually an ascender in most modern-day typefaces, in typefaces v text numbers the personality usually has a descender, because that example, in
Some people, specifically in Europe and also Latin America, create 7 through a heat in the middle and also make the peak line crooked. The line v the middle is advantageous to plainly differentiate the character from the number one, as these deserve to appear comparable when written in particular styles the handwriting.
In mathematicsSeven is a Mersenne prime, because 23 - 1 = 7Seven is both a Carol number and a Kynea numberSeven is the 4th prime number, the 2nd lucky prime, and the second safe primeSeven is the very first Newman-Shanks-Williams primeSeven is the first Woodall primeSeven is the fourth factorial primeSeven is the fourth Mersenne prime exponentSeven is the third Lucas primeSeven is the fourth self numberSeven is the just number less than 15 that cannot be represented as the sum of the squares of 3 integersSeven is the smallest happy number, except for the trivial instance of 17 is the just dimension, besides the acquainted 3, in i beg your pardon a vector cross product can be definedA team of seven is dubbed a heptadA seven-sided form is a heptagon. The continual n-gons because that n ≤ 6 deserve to be constructed by compass and straightedge alone, yet the constant heptagon cannot. Figurate number representing heptagons (including seven) are called heptagonal numbers. 7 is additionally a centered hexagonal number.
In numeral systems
|over 7 (octal, decimal, and also so on)||7|
In quaternary, 7 is the the smallest prime v a composite sum of digits.
In the English language, 7 is the only 2-syllable natural, hopeful 1-digitnumber7 is the sixth number of the alphabet
List of basic calculations
|7×xdisplaystyle 7 imes x||7||14||21||28||35||42||49||56||63||70||77||84||91||98||105||112||119||126||133||140||147||154||161||168||175||350||700||7000|
|7÷xdisplaystyle 7div x||7||3.5||2.3¯displaystyle 2.overline 3||1.75||1.4||1.16¯displaystyle 1.1overline 6||1||0.875||0.7¯displaystyle 0.overline 7||0.7|
|0.63¯displaystyle 0.overline 63||0.583¯displaystyle 0.58overline 3||0.538461¯displaystyle 0.overline 538461||0.5||0.46¯displaystyle 0.4overline 6|
|x÷7displaystyle xdiv 7||0.142857¯displaystyle 0.overline 142857||0.285714¯displaystyle 0.overline 285714||0.428571¯displaystyle 0.overline 428571||0.571428¯displaystyle 0.overline 571428||0.714285¯displaystyle 0.overline 714285||0.857142¯displaystyle 0.overline 857142||1||1.142857¯displaystyle 1.overline 142857||1.285714¯displaystyle 1.overline 285714||1.428571¯displaystyle 1.overline 428571|
|1.571428¯displaystyle 1.overline 571428||1.714285¯displaystyle 1.overline 714285||1.857142¯displaystyle 1.overline 857142||2||2.142857¯displaystyle 2.overline 142857|
|x7displaystyle x^7,||1||5||137 displaystyle 13_7 ||217 displaystyle 21_7 ||267 displaystyle 26_7 ||347 displaystyle 34_7 ||427 displaystyle 42_7 ||557 displaystyle 55_7 ||1017 displaystyle 101_7 ||1147 displaystyle 114_7 ||1307 displaystyle 130_7 ||1437 displaystyle 143_7 ||1567 displaystyle 156_7 ||2027 displaystyle 202_7 |
|2157 displaystyle 215_7 ||2317 displaystyle 231_7 ||2447 displaystyle 244_7 ||2607 displaystyle 260_7 ||3037 displaystyle 303_7 ||4047 displaystyle 404_7 ||5057 displaystyle 505_7 ||13137 displaystyle 1313_7 ||26267 displaystyle 2626_7 ||411047 displaystyle 41104_7 ||5643557 displaystyle 564355_7 ||113333117 displaystyle 11333311_7 |
PhysicsArranging corpuscle by fee from an adverse to positive and interpreting your charges as integer multiples of one elementary charge e* (1/3 e) one gets the following seven charges establish in nature:
|0. Generation||stem particle|
It is evident that a the contrary exists v no electromagnetic charge. It is suspect here, that the dimension of fee is linearly dependency on the number of quanta the angular turn generating it. In the state of symmetry no magnetic ingredient is generated since no angular spin exists. A particle in together a supersymmetric state would be dark because it can not electromagnetically interact. Breaking of supersymmetry the this topologically substructured superstring fragment would be a adjust of that is angular spin, generating equivalent particles that physics in dependence of the power level. This angular spin not just generates charge however highly non-linearly additionally gravo-magnetic mass in dependence of string stress and anxiety (energy). There appears to be just one generic unique geometry v a addressed functionality the a weak communicating superstring dark stem particle.(0. Generation).
In generations one to 3 there room two set of 3 physical particles through opposite fee according to the direction the angular spin. Because that all 3 generations just two geometrically and also functionally the same dark stem particles exist. These just differ by your handedness, generating matter and also antimatter corpuscle on break of 0-spin symmetry.
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The incident of matter and antimatter corpuscle is asymmetric through respect come this symmetry, -3 -1 +2 for matter and -2 +1 +3 for antimatter. Both to adjust of three particles space arranged in a complementary way around the symmetry allowed by this worldwide physical realization of the number seven. Therefore the number seven just emerges as a security superposition of two sets of physical particles that are created by break of a supersymmetric state. Nature just makes use of the symmetry detailed by the number seven. It however does no actually realize it. Seven seems to be much more "constructed" by arranging two sets of reality representing the number three approximately a state of symmetry.