mathematics (tsegaran)

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x Pi pi.png 3.14159265358979323846264338327950288419716939937510
Pi or π is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle's area to the square of its radius. The symbol π was first proposed by the...
x e   2.71828182845904523536
The mathematical constant e is the unique real number such that the value of the derivative (slope of the tangent line) of the function f(x) = e at the point x = 0 is exactly 1. The function e so defined is called the exponential function, and its...
x 1      
x 3,600,000      
x 0 A comparison of the letter O and the number 0 0
0 (zero) is both a number and the numerical digit used to represent that number in numerals. It plays a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, zero is used...
x −0   -0
Signed zero is zero with an associated sign. In ordinary arithmetic, −0 = 0. However, in computing, some number representations allow for the existence of two zeros, often denoted by −0 (negative zero) and +0 (positive zero). This occurs in some...
x 0.999... 999 Perspective 0.999...
In mathematics, the repeating decimal 0.999… which may also be written as or denotes a real number equal to one. In other words, the notations 0.999… and 1 represent the same real number. This equality has long been accepted by professional...
x 42 Answer to Life 42
42 (forty-two) is the natural number following 41 and preceding 43. The number has received considerable attention in popular culture due to its appearance in the The Hitchhiker's Guide to the Galaxy, as "the Answer to the Ultimate Question of Life,...
x 78   78
78 (seventy-eight) is the natural number following 77 and followed by 79. 78 is a triangular number, and its factorization makes it a sphenic number. As a multiple of a perfect number, 78 is itself a semiperfect number. 77 and 78 form a Ruth-Aaron...
x 311   311
311 is the natural number after 310 and before 312. 311 is a twin prime with 313; an Eisenstein prime with no imaginary part and real part of the form 3n − 1; a Gaussian prime with no imaginary part and real part of the form 4n − 1; and a permutable...
x 201    
201 is the natural number following 200 and preceding 202. It may be written as "two hundred one" or "two hundred and one". As the two factors of 201 are both Gaussian primes, 201 is a Blum integer. 201 is a Harshad number in base 10.
x Number of people on earth   6.500000000  
x 2147483647 Euler 2147483647
The number 2,147,483,647 is the eighth Mersenne prime, equal to 2 − 1. It is one of only four known double Mersenne primes. The primality of this number was proved by Leonhard Euler, who reported the proof in a letter to Daniel Bernoulli written in...
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