I observed that you enjoyed my last post ( part 1 ) about the mathematicians born in October, so I decided to write a post for every 6 mathematicians (I believe it just easy to read and the post is not that long if there are only 6). In case you are not familiar with this project of mine here is a small description:

*With this project I just to show how many people worked and transformed the mathematics we are learning now. As a small reminder you can find this event on: Google+ , Facebook and also you can use #CelebratewithLThMath on Tumblr , Twitter or Instagram. Just to make you a little curious there will be approx 37 mathematicians, so far we have 12 mathematicians covered so far. *

So lets start with the 6 ones for this post:

**1. Richard Dedekind** born on 6th October 1831 was a German mathematician who made important contributions to abstract algebra (particularly ring theory), algebraic number theory and the foundations of the real numbers.

He stated that if there existed a *one-to-one correspondence between two sets*, Dedekind said that the two sets were “similar”. He invoked similarity to give the first precise definition of an infinite set: a set is infinite when it is “similar to a proper part of itself.” (this is similar to what it is done when we study if a set is countable or not). He was a good friend with Cantor and was admiring Cantor’s work on infinite sets.

He also came with the idea of an* ideal* ( he defined an ideal as a subset of a set of numbers, composed of algebraic integers that satisfy polynomial equations with integer coefficients).

**2. Sergei Lvovich Sobolev **born on 6th October 1908 was a Soviet mathematician working in mathematical analysis and partial differential equations.

*Sobolev spaces* are used for growth conditions on the Fourier transforms and are an important subject in* functional analysis*.

Generalized functions (later known as *distributions*) were first introduced by Sobolev in 1935 for weak solutions. The theory of distribution is considered now as the calculus of the modern epoch.

He was a Moscow State University professor from 1935 to 1957 and also a deputy director of the Institute for Atomic Energy 1943-57 where he participated in the A-bomb project of the USSR. He was the founder and first director of the Institute of Mathematics at Akademgorodok near Novosibirsk, which was later to bear his name. In 1962 he called for a reform of the Soviet education system.

**3. Evgenii Mikhailovich Landis **born on 6th October 1921 was a Soviet mathematician who worked mainly on partial differential equations (especially on uniqueness theorems for elliptic and parabolic differential equations).

**4. Claude Gaspard Bachet de Méziriac **born on 9th October 1581 was a French mathematician, linguist, poet and classics scholar.

He wrote the “Problèmes plaisants” which contains an interesting collection of *arithmetical tricks and questions*. He was the earliest writer who discussed the solution of indeterminate equations by means of continued fractions. He also did work in number theory and found a method of *constructing magic squares*.

But of all things, he is famous for *translating, from Greek to Latin, the “Arithmetica” of Diophantus* ( in 1621). It was this very translation in which Fermat wrote his famous margin note claiming that he had a proof of Fermat’s last theorem.

**5. Johann Segner **born on 9th Ocotber 1704 was a Hungarian scientist (mathematician, physicist, physician).

In 1735 he became the first professor of mathematics, a position created for him, at the University of Göttingen.

Segner produced the first proof of Descartes’ rule of signs ( is a technique for determining the number of positive or negative real roots of a polynomial).

Historians of science remember him as the father of the water turbine.

**6. Albert Shiryaev **born on 12th October 1934 (age 80) is a Russian mathematician. He is known for his work in probability theory, statistics and financial mathematics.

He is a professor of the department of mechanics and mathematics of Moscow State University, since 1971. He was elected a corresponding member of the Russian Academy of Sciences in 1997 and a full member in 2011. As of 2007 Shiryaev holds a 20% permanent professorial position at the School of Mathematics, University of Manchester.

SOOOooo… ** Let us CELEBRATE the MATHEMATICIANS born in October Together!!! **Thank you for your support and cooperation so far!

Hope you liked this post, and if you would like to know more email me at LThMathematics@gmail.com Any feedback is appreciated so use the like and share buttons!

Check my Facebook page, my Tumblr, my just started Google+ page and also my new Twitter (I am really new to the last 2 things, so bare with me if you see stupid mistakes there) and Instagram. Thank you for reading and enjoy your day. Have a great weekend.