### Where does the mathematical term pi come from

If the ratio was different, it wouldn't be a circle. The following figure shows how the circumference of a circle with a diameter of 1. When the ancient Babylonians attempted to measure the precise areas of circles back in B. The ancient Egyptians came up with 3. The Greek mathematician Archimedes B. The symbol's use was later popularized by 18th-century Swiss mathematician Leonhard Euler but wasn't adopted worldwide until The fact that pi can be found everywhere — not only in circles, but in arcs, pendulums and interplanetary navigation — and that it's infinitely long has inspired a cult following that includes plenty of geeky tattoos and even its own national holiday.

Keep reading to learn how you, too, can celebrate National Pi Day. We've Got Your Numbers Quiz. Mathematician Cracks the 33 Problem.

The iterative algorithms were widely used after because they are faster than infinite series algorithms: whereas infinite series typically increase the number of correct digits additively in successive terms, iterative algorithms generally multiply the number of correct digits at each step. For example, the Brent-Salamin algorithm doubles the number of digits in each iteration. In , brothers John and Peter Borwein produced an iterative algorithm that quadruples the number of digits in each step; and in , one that increases the number of digits five times in each step.

New infinite series were discovered in the s and s that are as fast as iterative algorithms, yet are simpler and less memory intensive. This series converges much more rapidly than most arctan series, including Machin's formula.

## Pi Day: History of Pi | Exploratorium

The associated random walk is. As n varies, W n defines a discrete stochastic process. This Monte Carlo method is independent of any relation to circles, and is a consequence of the central limit theorem , discussed below.

Mathematicians Stan Wagon and Stanley Rabinowitz produced a simple spigot algorithm in Another spigot algorithm, the BBP digit extraction algorithm , was discovered in by Simon Plouffe: [] []. Variations of the algorithm have been discovered, but no digit extraction algorithm has yet been found that rapidly produces decimal digits. For example, an integral that specifies half the area of a circle of radius one is given by: [].

The trigonometric functions rely on angles, and mathematicians generally use radians as units of measurement. In many applications, it plays a distinguished role as an eigenvalue. One way to obtain this is by estimating the energy.

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As mentioned above , it can be characterized via its role as the best constant in the isoperimetric inequality : the area A enclosed by a plane Jordan curve of perimeter P satisfies the inequality. The Sobolev inequality is equivalent to the isoperimetric inequality in any dimension , with the same best constants. This is the integral transform , that takes a complex-valued integrable function f on the real line to the function defined as:. The uncertainty principle gives a sharp lower bound on the extent to which it is possible to localize a function both in space and in frequency: with our conventions for the Fourier transform,.

The physical consequence, about the uncertainty in simultaneous position and momentum observations of a quantum mechanical system, is discussed below. The fields of probability and statistics frequently use the normal distribution as a simple model for complex phenomena; for example, scientists generally assume that the observational error in most experiments follows a normal distribution.

For this to be a probability density, the area under the graph of f needs to be equal to one. This follows from a change of variables in the Gaussian integral : []. Then V is a two-dimensional real vector space , with two parameters corresponding to a pair of initial conditions for the differential equation. The Euler characteristic of a sphere can be computed from its homology groups and is found to be equal to two.

Thus we have. The constant appears in many other integral formulae in topology, in particular, those involving characteristic classes via the Chern—Weil homomorphism. Vector calculus is a branch of calculus that is concerned with the properties of vector fields , and has many physical applications such as to electricity and magnetism. The Newtonian potential for a point source Q situated at the origin of a three-dimensional Cartesian coordinate system is []. The field, denoted here by E , which may be the Newtonian gravitational field or the Coulomb electric field , is the negative gradient of the potential:.

Special cases include Coulomb's law and Newton's law of universal gravitation. More general distributions of matter or charge are obtained from this by convolution , giving the Poisson equation. The factorial function n! The gamma function extends the concept of factorial normally defined only for non-negative integers to all complex numbers, except the negative real integers.

The gamma function is defined by its Weierstrass product development: []. Further, it follows from the functional equation that. The gamma function can be used to create a simple approximation to the factorial function n! Ehrhart's volume conjecture is that this is the optimal upper bound on the volume of a convex body containing only one lattice point. Finding a simple solution for this infinite series was a famous problem in mathematics called the Basel problem.

For distinct primes, these divisibility events are mutually independent; so the probability that two numbers are relatively prime is given by a product over all primes: []. This is a special case of Weil's conjecture on Tamagawa numbers , which asserts the equality of similar such infinite products of arithmetic quantities, localized at each prime p , and a geometrical quantity: the reciprocal of the volume of a certain locally symmetric space. This functional determinant can be computed via a product expansion, and is equivalent to the Wallis product formula.

The Fourier decomposition shows that a complex-valued function f on T can be written as an infinite linear superposition of unitary characters of T. That is, continuous group homomorphisms from T to the circle group U 1 of unit modulus complex numbers. There is a unique character on T , up to complex conjugation, that is a group isomorphism.

For example, the Chudnovsky algorithm involves in an essential way the j-invariant of an elliptic curve. An example is the Jacobi theta function. Certain identities hold for all automorphic forms.

An example is. The total probability is equal to one, owing to the integral:. The Cauchy distribution plays an important role in potential theory because it is the simplest Furstenberg measure , the classical Poisson kernel associated with a Brownian motion in a half-plane. The Hilbert transform H is the integral transform given by the Cauchy principal value of the singular integral. The point 0. A simple formula from the field of classical mechanics gives the approximate period T of a simple pendulum of length L , swinging with a small amplitude g is the earth's gravitational acceleration : [].

It is defined as exactly. The sinuosity is the ratio between the actual length and the straight-line distance from source to mouth. Faster currents along the outside edges of a river's bends cause more erosion than along the inside edges, thus pushing the bends even farther out, and increasing the overall loopiness of the river. However, that loopiness eventually causes the river to double back on itself in places and "short-circuit", creating an ox-bow lake in the process.

Such memorization aids are called mnemonics. An early example of a mnemonic for pi, originally devised by English scientist James Jeans , is "How I want a drink, alcoholic of course, after the heavy lectures involving quantum mechanics. The digits are large wooden characters attached to the dome-like ceiling. The digits were based on an calculation by English mathematician William Shanks , which included an error beginning at the th digit.

### Pi is everywhere

The error was detected in and corrected in Several college cheers at the Massachusetts Institute of Technology include "3. The bill is notorious as an attempt to establish a value of scientific constant by legislative fiat. The bill was passed by the Indiana House of Representatives, but rejected by the Senate, meaning it did not become a law.

The versions are 3, 3.

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From Wikipedia, the free encyclopedia. This article is about the mathematical constant. For the Greek letter, see Pi letter. For other uses, see Pi disambiguation. Ratio of the circumference of a circle to its diameter. Buffon's needle. Needles a and b are dropped randomly. Random dots are placed on the quadrant of a square with a circle inscribed in it. Main article: Piphilology. Special Functions.

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## The Beauties Hidden in Pi(π)

Cambridge University Press. Ganita Bharati. The Mathematical Intelligencer. Zeit Online in German.

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## How Pi Works

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### Various Formulas for Computing Pi

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