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9 (število) Vsebina Razvoj števke | V matematiki | V znanosti | V mitologiji | Drugo | Navigacijski menish850919794485639-8

Cela števila


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9 (število)




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9


−1
0
1
2
3
4
5
6
7
8
9




Seznam števil — Cela števila




0
10
20
30
40
50
60
70
80
90



Glavni števnikdevet
Vrstilni števnikdeveti
Številski sistem
devetiški
Razcep
32displaystyle 3^2,
Rimska številkaIX ali VIIII
Dvojiško1001
Osmiško11
Dvanajstiško9
Šestnajstiško9
Matematične značilnosti

φ(9) = 5

τ(9) = 3 1, 3, 9

σ(9) = 13

π(9) = 4

μ(9) = 0

M(9) = -2

9 (devét) je naravno število, za katero velja 9 = 8 + 1 = 10 - 1.




Vsebina





  • 1 Razvoj števke


  • 2 V matematiki


  • 3 V znanosti


  • 4 V mitologiji


  • 5 Drugo

    • 5.1 Leta





Razvoj števke |


razvoj števke 9



V matematiki |


  • drugo Kaprekarjevo število.

  • tretje polpraštevilo.

  • tretje kvadratno število 9=32displaystyle 9=3^2,!.

  • tretje Prothovo število 9 = 23 + 1.

  • tretje Cullenovo število 9=2⋅22+1displaystyle 9=2cdot 2^2+1.

  • četrto sestavljeno število.

  • četrto srečno število.

  • peto desetiško samoštevilo.

  • šesto Størmerjevo število.


  • Harshadovo število.

Vsako pozitivno celo število je vsota največ 9. enakih ali različnih kubov (glej Waringov problem).



V znanosti |



  • vrstno število 9 ima fluor (F).


V mitologiji |


Že Pitagora je spoštoval število 9, kot izjemno število ker seštevki zmožkov števil od 1 do 9 dajejo vedno znova število 9, kot sledi:


  • 1 · 9 = 9 (0+9 = 9),

  • 2 · 9 = 18 (1+8 = 9),

  • 3 · 9 = 27 (2+7 = 9),

  • 4 · 9 = 36 (3+6 = 9),

  • 5 · 9 = 45 (4+5 = 9),

  • 6 · 9 = 54 (5+4 = 9),

  • 7 · 9 = 63 (6+3 = 9),

  • 8 · 9 = 72 (7+2 = 9),

  • 9 · 9 = 81 (8+1 = 9).

V mitologiji poznamo tudi 9 muz, to število je uporabljeno tudi v mnogih pravljicah za devetimi gorami, za devetimi vodami, itd.



Drugo |



Leta |



  • 9 pr. n. št., 9, 2009








Vzpostavljeno iz »https://sl.wikipedia.org/w/index.php?title=9_(število)&oldid=4758474«










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