e-day - A mathematical holiday celebrated on February 7th

e-day - A mathematical holiday celebrated on February 7th
7 Feb. 2018

Today, February 7th, 2018, is called e-day because e is approximately 2.718, and this date is written 2/7/18 in some parts of the world.

e, also called Euler’s Number after the Swiss mathematician Leonhard Euler, is a very important constant that comes up in many different places in mathematics. The numer e was discovered by the Swiss mathematician Jacob Bernoulli while studying compound interest where e arises as the limit of (1 + 1/n)n as n approaches infinity. e can also be calculated by summing:

The constant e appears naturally on the exponential function, which models growth. Hence, the same way that the constant π appears in everything that is round, the number e appears in everything that grows: size of baby animals, leaves in trees, bacteria populations, spreading of diseases, spirals in flowers and snails, radiactive decay of elements, money invested in a bank, processing power of computers… Everything that grows the faster the bigger it is follows an exponential law, and contains the number e.

e has an infinite number of digits. We prepared a website listing the first 60.000 digits of e and help you find your birthday in it:

If we assign a number to each letter in the alphabet we can even find your name within the digits of e, along with the complete works of William Shakespeare, the ending of Game of Thrones (spoiler alert), the full text of the Wikipedia from the year 2030 or what you’ll have tomorrow for breakfast…

At least that’s what conjectured: It is conjectured that e is a normal number. In normal numbers every possible sequence of digits of a certain length appears with the same frequency. There are approximately as many 1s as 9s, as many 23s as 42s, as many 0000s as 1111s, etc. So within the infinite digits of a normal number we are able to find any possible sequence of any finite length.

Happy e-day to you!

Archivos

Todas las noticias

10 Oct. 2014

Together with the African Institute for Mathematical Sciences (AIMS) South Africa and the AIMS Next Einstein Initiative, IMAGINARY is planning a series of events to boost mathematics communication on the African continent in the near future. After the first very successful event in Dar es Salaam, Tanzania, we will introduce two upcoming events: a congress in Rabat, Morocco, and a workshop-conference in Cape Town, South Africa.Leer más

13 Ago. 2014

IMAGINARY is present at the ICM 2014 in Seoul with the biggest exhibition so far, NIMS-IMAGINARY and a special panel titled “Mathematics communication for the future - a vision slam”. Furthermore IMAGINARY is collaboration partner of the ...Leer más

25 Jun. 2014

There will be a big IMAGINARY exhibition in Heidelberg, Germany, July 20 - August 10!
The Kulturhaus Karlstorbahnhof is an attractive location, which even has its own movie theater.

There will be four exhibition stations:

  1. The well known IMAGINARY cube showcasing
  2. ...Leer más
15 Abr. 2014

El Centro de Arte y Tecnología de Zaragoza, Etopía, abrió el pasado 9 de abril un nuevo espacio expositivo «Ciencia Remix», que incluye dos exposiciones: Matopía y Ciencia Ciudadana.

Matopía es una exposición matemática que incluye entre otros los módulos MarteMáticas (matemáticas en el arte), Suertes (sobre el azar), o el programa SURFER de...Leer más

8 Abr. 2014

El juego 2048 original fue creado por el joven programador italiano de 19 años Gabriele Cirulli (ver el originall). Este juego online se ha convertido en todo un fenómeno viral, probablemente por lo atractivo de su simplicidad. ¿Todavía no te has enganchado?

¡Prueba la versión SURFER del juego!

http://2048....Leer más

Páginas