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

21 Oct. 2017

Mathematics of Planet Earth, UNESCO, the International Mathematical Union (IMU), the International Commission on Mathematical Instruction (ICMI), and IMAGINARY are announcing the winners of the second international competition for exhibition modules for the Open Source Exhibition Mathematics of Planet Earth (MPE). This project aims to showcase ways in which the mathematical sciences are useful for understanding our planet and addressing the challenges of sustainable development and global changes.Leer más

2 Oct. 2017

Coinciding with the tradition in some countries of the Black History Month, the Black Mathematician Month is an effort for public sensiblilzation of the presence of the black minority in the mathematical community. Promoted by the Chalkdust magazine, a series of articles written by black mathematicians will appear in that magazine and...Leer más

18 Jun. 2017

Submit your exhibition modules to participate in the new competition for Mathematics of Planet Earth (MPE).

We are looking for exhibition modules, which raise the awareness of the mathematics involved in the planet’s ecosystem or in the way civilization is organized. Modules submitted to this competition can be of one...Leer más

5 Mayo. 2017

Millions of visitors in more than 50 countries and 27 languages have experienced the IMAGINARY exhibition, initiated at the Mathematisches Forschungsinstitut Oberwolfach in the context of the Year of Mathematics 2008. Indeed, our open source philosophy still creates overwhelming feedback around the globe and hence...Leer más

24 Ene. 2017

We are calling students of the Art and Design fields as well as independent Artists and Designers to participate in the Math Creations contest for Art, Design and Mathematics. The goal of the contest is new creative ideas based on mathematical concepts and their realization. It is organized by the special research fields “Discretization in Geometry and Dynamics” and “Raum - Zeit - Materie. Analytische und Geometrische Strukturen” in collaboration with IMAGINARY.Leer más

Páginas