LE JOUR DE PI MONTRÉAL 3.141592653..... Event Cache

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Hidden : Saturday, March 14, 2015
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LE JOUR DE PI MONTRÉAL 3.141592653.....

Venez célébrer avec nous le jour du nombre .
Pourquoi ce jour-là?
Aux Etats-Unis, la date est indiquée dans le format mois/jour/année donc ce qui est pour nous le 2015/03/14 est enregistré comme 3/14/15. La plupart des gens savent que  est 3.14 mais peu savent que est 3.141592653....
Nous allons nous rencontrer aux coordonnées indiquées vers 9:20 et précisément à 9:26:53, nous allons prendre la photo de groupe. Ensuite, on pourra continuer à discuter, à échanger des trackables et ainsi de suite.
Fait intéressant, aujourd'hui, il y a 136 ans, est né Albert Einstein.

Et n'oubliez pas, Groundspeak vous offre une icône souvenir.

Selon Wikipedia
Pi est un nombre, que l’on représente par la lettre grecque du même nom : . C’est le rapport constant de la circonférence d’un cercle à son diamètre dans un plan euclidien. On peut également le définir comme le rapport de la superficie d’un cercle au carré de son rayon. Sa valeur approchée par défaut à moins de 0,5×10–15 près est 3,141 592 653 589 793 en écriture décimale. De nombreuses formules, de physique, d’ingénierie et bien sûr de mathématiques, impliquent , qui est une des constantes les plus importantes des mathématiques. Le nombre  est irrationnel, c’est-à-dire qu’on ne peut pas l’exprimer comme un rapport de deux nombres entiers ; ceci entraîne que son écriture décimale n’est ni finie, ni périodique. C’est même un nombre transcendant, ce qui signifie qu’il n’existe pas de polynôme non nul à coefficients entiers dont π soit une racine. La détermination d’une valeur approchée suffisamment précise de , et la compréhension de sa nature sont des enjeux qui ont traversé l’histoire des mathématiques ; la fascination exercée par ce nombre l’a même fait entrer dans la culture populaire. L’usage de la lettre grecque , première lettre de « περίμετρος » — périmètre en grec —, n’est apparu qu’au XVIIIe siècle. Auparavant, sa valeur était désignée par diverses périphrases comme la « constante du cercle » ou son équivalent dans diverses langues.

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Come celebrate with us the day of the number .
Why that day?
In United States, the date is given in the format month/day/year, so what is for us 2015/03/14 is registered as 3/14/15. Most people know that  is 3.14 but fewer people know that  is 3.141592653....
We will meet at the coordinates at 9:20, and precisely at 9:26:53 we will take the group photo. Then we will continue to discuss, exchange trackables and so on.
Interesting fact, today, 136 years ago, was born Albert Einstein.

And remember, Groundspeak offers a souvenir icon.

From Wikipedia
The number  is a mathematical constant, the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter "" since the mid-18th century, though it is also sometimes spelled out as "pi". Being an irrational number,  cannot be expressed exactly as a common fraction, although fractions such as 22/7 and other rational numbers are commonly used to approximate π. Consequently its decimal representation never ends and never settles into a permanent repeating pattern. The digits appear to be randomly distributed; however, to date, no proof of this has been discovered. Also, π is a transcendental number – a number that is not the root of any non-zero polynomial having rationalcoefficients. This transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge. Although ancient civilizations needed the  to be computed accurately for practical reasons, it was not calculated to more than seven digits, using geometrical techniques, in Chinese mathematics and to about five in Indian mathematics in the 5th century CE. The historically first exact formula for , based on infinite series, was not available until a millennium later, when in the 14th century the Madhava–Leibniz series was discovered in Indian mathematics. In the 20th and 21st centuries, mathematicians and computer scientists discovered new approaches that, when combined with increasing computational power, extended the decimal representation of  to, as of late 2013, over 13.3 trillion (1013) digits. Scientific applications generally require no more than 40 digits of π so the primary motivation for these computations is the human desire to break records. However, the extensive calculations involved have been used to test supercomputers and high-precision multiplication algorithms. Because its definition relates to the circle,  is found in many formulae in trigonometry and geometry, especially those concerning circles, ellipses or spheres. It is also found in formulae used in other branches of science such as cosmology, number theory, statistics, fractals, thermodynamics, mechanics and electromagnetism. The ubiquity of π makes it one of the most widely known mathematical constants both inside and outside the scientific community: Several books devoted to it have been published, the number is celebrated on Pi Day and record-setting calculations of the digits of π often result in news headlines. Attempts to memorize the value of π with increasing precision have led to records of over 67,000 digits.

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