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

2015년 2월 9일

On the occasion of the 50 year long diplomatic relations between Germany and Israel, the project IMAGINARY Israel by the Mathematisches Forschungsinstitut Oberwolfach (MFO) will be announced in conjuction with a visit by German Federal Minister of Education and Research Johanna Wanka at the...더 보기

2014년 12월 16일

2014 is the International Year of Crystallography (IYCr2014), which is an event promoted in the year 2014 by the United Nations to celebrate the centenary of the discovery of X-ray crystallography and to emphasise the global importance of crystallography in human life. One of the main goals of IYCr2014 is to increase public awareness...더 보기

2014년 11월 3일

We are pleased to announce that we received funding by Cap’Maths to establish an autonomous unit “IMAGINARY France” starting in December 2014.  Its purpose is to translate all existing content into French, to have more contributions from French mathematicians and organize exhibitions and events in France. The first meeting to discuss the composition of the...더 보기

2014년 10월 10일

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.더 보기

2014년 8월 13일

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...더 보기

페이지