Four (341 hits)
Category: Science & EnvironmentalRating: -1 on 11 reviews (Rate this item) (V)
Submitted by Cool Ubersite User (View user info) at 2007-03-22 16:02:53 EDT
User Reviews
Submitted by redskieslookfake (user info) at 2007-03-23 03:40:00 EDT (#)
Ranking: -2
No Comment
Submitted by Foolproof (user info) at 2007-03-22 18:15:34 EDT (#)
Ranking: -2
Aaaaaaaaaaaaaand...CRAP!
Submitted by pen_name (user info) at 2007-03-22 18:02:40 EDT (#)
Ranking: 0
post 99950
Submitted by ICO (user info) at 2007-03-22 17:59:54 EDT (#)
Ranking: -2
Craply spelled burn below.
Submitted by nitty34 (user info) at 2007-03-22 17:35:55 EDT (#)
Ranking: -2
Your name is suprisingly deceptive.
Submitted by Slash (user info) at 2007-03-22 17:07:16 EDT (#)
Ranking: 0
Tetris = Four.
Submitted by MidnightToSix (user info) at 2007-03-22 16:39:02 EDT (#)
Ranking: 0
> 4 is the supreme number of the universe according to the Time Cube.
Well then it must be true.
Submitted by Adamdidit2u (user info) at 2007-03-22 16:31:12 EDT (#)
Ranking: -2
4 (four) is a number, numeral, and glyph. It is the natural number following 3 and preceding 5.
In mathematics
Four is the smallest composite number, its proper divisors being 1 and 2. Four is also a highly composite number. The next highly composite number is 6. Four is the second square number, the second centered triangular number. 4 is the first non-unitary square prime (2^2). It has a aliquot sum σ(n) 3 which is itself a prime. The aliquot sequence of 4 has 4 members (4,3,1,0) this number being the 1st composite member of the 3-aliquot tree.
Four is the only number in the English language for which the number of letters in its name is equal to the number itself. This is also true in several other languages.
Four is the smallest composite number that is equal to the sum of its prime factors. As a consequence of this, it is the smallest Smith number.
It is also a Motzkin number.
In addition, . Continuing the pattern in Knuth's up-arrow notation, , and so on, for any number of up arrows.
A four-sided plane figure is a quadrilateral (quadrangle) or square, sometimes also called a tetragon. A circle divided by 4 makes right angles. Because of it, four (4) is the base number of plane (mathematics). Four cardinal directions, four seasons, duodecimal system, and vigesimal system are based on four.
A solid figure with four faces is a tetrahedron. The regular tetrahedron is the simplest Platonic solid. A tetrahedron, which can also be called a 3-simplex, has four triangular faces and four vertices.
The smallest non-cyclic group has four elements; it is the Klein four-group. Four is also the order of the smallest non-trivial groups that are not simple.
The four-color theorem states that a planar graph (or, equivalently, a flat map of two-dimensional regions such as countries) can be colored using four colors, so that adjacent vertices (or regions) are always different colors. Three colors are not, in general, sufficient to guarantee this.
Lagrange's four-square theorem states that every positive integer can be written as the sum of at most four square numbers. Three are not always sufficient; 7 for instance cannot be written as the sum of three squares.
Four is the first positive non-Fibonacci number.
Each natural number divisible by 4 is a difference of squares of two natural numbers, i.e. 4x = y2 − z2.
Four is an all-Harshad number and a semi-meandric number.
4 is the supreme number of the universe according to the Time Cube.
Submitted by The_Drake (user info) at 2007-03-22 16:18:26 EDT (#)
Ranking: -2
This is even worse than the other ones.
Submitted by sideshow (user info) at 2007-03-22 16:11:27 EDT (#)
Ranking: 0
Oh ya...
Submitted by ih8u2man (user info) at 2007-03-22 16:04:30 EDT (#)
Ranking: 2
It's clearly four.