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

e-day - A mathematical holiday celebrated on February 7th
2018년 2월 7일

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:

e-day website

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!

관련 자료

All News

2014년 6월 25일

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
  2. ...더 보기
2014년 4월 15일

The Center of Art and Technology of Zaragoza, Etopía, opened the last April 9th an expositive space “Ciencia Remix” (Science remix), that includes two exhibitions: Matopía and Ciencia Ciudadana (Citizen science).

Matopía is a mathematics exhibition that features amongst others the exhibits MarteMáticas (math in art), Suertes (probability), and IMAGINARY’s program...더 보기

2014년 4월 8일

The original 2048 online puzzle game was created by 19 year old Italian developer Gabriele Cirulli (see the original game). It instantly became a massive viral hype, probably because it is beautiful in its simplicity. Are you addicted yet?

Try our SURFER version of the game! 

http://...더 보기

2014년 3월 24일

How we get our information, how we live and how we communicate - all this has changed radically over the past two decades. Digital technologies play an important role in our everyday lives and provide us with a whole range of new options. Some call it a digital revolution that is matched in scale only by the invention of the printing press. Science Year 2014 “The Digital Society” shows how research can produce new solutions to promote this...더 보기

2014년 2월 10일

On February 2nd, 2014, the first permanent exhibition of the Museum of Mathematics of Catalonia (MMACA) opened its doors in Cornellà de Llobregat (Barcelona), after more than six years of traveling exibitions around towns and cities of Spain.

On February 5th the opening ceremony took place, with large attendance and supported by the Catalan mathematical and...더 보기