Three

The three (3) is the natural number that follows two and precedes four. He is a twin cousin with the five.

Three is an odd number formed by the sum of 2 and 1.

Math

• 2.or First and first.♪ odd prime number. In addition, 3 is 1.♪ prime number of Fermat (n = 0).
• An approximation of π (3.1415...) and of e (2.71828.) when making quick estimates.
• The rule of three is an important procedure of arithmetic, is based on the equality of two geometric reasons, being unknown the second consequent.
• It is the sum of the first two natural numbers, if the zero is discarded as a natural number. Or the sum of the first two positive integers.
• It is the minimum of the measures of an entire cathet, considering that the other cathet and the hypotenuse are also integers.
• All its ensymous roots are irrational numbers and algebraic numbers, which tend to 1, when the index becomes ever larger
• As an integer is the canonical representative of the kind of equivalence of natural numbers {(m,n)/ (m,n)~(3,0) or m+0= n+3; m, n 한N}.
• As a rational number is the canonical representative of the class of equivalence of integers {(m,n)/ (m,n)~(3,1) or m.1= n.3; m, n 한Z}
• As a real number, the decimal number 2.999...
• As a complex number is the ordered pair of real numbers (3.0) 0 well 3+0i, in binary notation.
• The three is an algebraic number, being the root of the algebraic equation 2x− − 6=0{displaystyle 2x-6=0}
• The 3 is a whole Gaussian, also whole Gaussian cousin.
• 1.♪ Mersenne's cousin number.
• 2nd number of Lucas.
• The 3 is also the 2nd triangular number, after 1 and before 6.
• 4th term of Fibonacci succession, after 2 and before 5.
• The polygon of 3 sides receives the name of triangle.
• If you multiply a number by three, you get the triple of that number; whereas, if divided by three, a third. The Cube of a number (number multiplied 3 times per se) is represented with the 3 as exponent, as in n³.
• A natural number is divisible between three if the sum of your digits is divisible between three. For example, the number 21 is divisible between 3 (3 times 7) and the sum of your digits is 2 + 1 = 3. This process can be repeated as many times as necessary (example: 16 893 702 sum 36, 3 + 6 = 9, which is clearly divisible between 3). Because of this, the reversion of any number that is divisible between three (or in its default, any permutation in its digits) is also divisible between 3. Thus, 1368 and its reverse 8631 are both divisible between 3 (1 + 3 + 6 + 8 = 18), and are also 1386, 3168, 3186, 3618, etc.
• There are infinity of quaterns that satisfy the indetermined cubic equation of 4 z variables³+ u³ +v³ = w³. One of the simplest and most beautiful: 3³+ 4³ +5³ = 6³

Chemistry

• Atomic number of lithium.

Physics

• 3 spatial dimensions are perceived by the human being, but some theories of physics such as string theory suggest there is more.
• The bars are a family of subatomic particles formed by three quarks.
• There are 3 Newton laws.

Astronomy

• Messier M3 object is a globular cluster in the constellation of Canes Venatici.
• Object of the New General Catalog NGC 3 is a lenticular galaxy in the constellation of Pisces.

Use in Spanish

Number 3 in Circle.

With its three stars, the Orion Belt is one of the most visible constellations in the sky.

• The term Three. can be both substantive (“the Three. of cups”) as a numeral determinant (“Three. books»).
• The ordinal third is nicknamed in front of a male noun: “the third man” (but “the third dozen”).
• As a multiplier numeral adjective, the form triple is the most common for both genres: "triple prize". Triplo and tripla They are rare.
• As a partitive or fractional number, there is the noun third: “one third of the population”, and the adjective Third.

Features

• In many cultures the 3 is represented by three points, as in the case of Maya numeration, or by three strokes (horizontal or vertical). For example, in the Roman numeration (III) and in the Chinese numbering.
• 3 support points are required to stand in pej balance: the tripod.
• It is necessary and sufficient 3 unaligned points to determine a plane and a circumference.
• In medieval Christian culture is a perfect number. It symbolizes the continuous movement and perfection of the finished, as well as symbol of the Trinity particularly when one of the vertices indicates upwards as a spiritual direction, therefore considered by believers as a celestial number.