Number two

The two is a natural number, written in the Indian Arabic system as 2, in Roman numerals as II, in some cases written ii.

Summary

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  • 1 Arithmetic properties
  • 2 In various numbering bases and others
  • 3 Algebraic properties
  • 4 Geometric properties
  • 5 The two in human anatomy
  • 6 Bibliographic citations
  • 7 Sources

Arithmetic properties

  • It is a natural number, according to Peano’s axiomatic, [1]is the successor of 1; id. est s (1) = 1
  • It is an even number; since 2 × 1 = 2
  • Well, it is a prime natural number, since there is no divisor of it, between 2 and 1
  • It is an additive positive, opposite or inverse integer of -2; their integer divisors are ± 1 and ± 2
  • It is a rational number whose multiplying inverse is 1/2; 2 is the representative element of the class of integers {(2; 1); (2h; h)}
  • It is a real limit number of 1,999 …
  • It is a real complex number
  • It is a non-prime Gaussian integer, since it supports factorization (1-i) (1 + 1)

In various numbering bases and others

  • In the ternary, quaternary, quinary, senary, octal, decimal, duodecimal, hexadecimal, etc. numbering systems, it is simply denoted by 2.
  • Binary 10
  • Roman numerals II
  • Maya numbering ºº
  • Secondordinal
  • partitive half
  • double: twice as large
  • pair: set of two objects; for example, a pair of shoes from the same person.
  • ordered pair: arrangement of two elements, subject to their ordering.

Algebraic properties

Nonrational equations and operations

  • It is square root of 4, cube root of 8, fourth root of 16, nthroot of 2 n , here n is a positive integer n ≥ 2.
  • 2 is the vulgar logarithm of 100
  • 4= 4 2 , result regardless of the commutativity.
  • In a quadratic or quadratic algebraic equation the greatest exponent is 2.
  • A quadratic equation has 2 roots.
  • An imaginary complex number (a + bi, b ≠ 0) has two square roots.
  • is the third Fibonaci number, results by adding x 0= 1 and x 1 = 1. [2]

Abeliano group

  • The set {0,1} of division remains in Z, by 2, form an abelian group with the sum:

1 + 1 = 0

1 + 0 = 1

0 + 1 = 1

0 + 0 = 0

neutral element 0

Opposite elements: 1 is 1, 0, 0.

Geometric properties

  • Any quadrilateral has exactly two diagonals.
  • Two different parallels are cut at exactly two points by a third.
  • A point on a line determines two rays only, also only two rays.
  • Two intersecting lines determine a plane and only one [3]
  • Every line segment has two ends.
  • any ceviana that starts from a vertex of a triangle splits the opposite side in parts, if it goes through the inside of the side.
  • the trivial topology contains only 2 sets: the set X and the empty set {} [4]

The two in human anatomy

  • There are two legs
  • there are two feet
  • there are two knees
  • There are two hands
  • there are two eyes
  • There are two lungs
  • There are two nostrils
  • There are two two ears
  • there are two shoulders
  • There are two feet
  • There are kidneys
  • There are two elbows
  • there are two dolls
  • there are two shoulders
  • there are two eyebrows
  • there are two cheekbones
  • there are two cheeks.

All this is a sample of the axial symmetry of many human organs.

 

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