We are on 20th October and just a little over half of the mathematicians of the month are covered. Impressive the fact that in the last 11 days we are celebrating 21 mathematicians, while in 20 days we have only 18. I am really impressed by now much you like this event (* As a small reminder you can find this event on: Google+ , Facebook and also you can use #CelebratewithLThMath on Tumblr , Twitter or Instagram. ) *and thank you for your support. It really means a lot for me, and it also gives me confidence to do other projects in the future. But lets go to our 6 mathematicians:

**1. Robert Simson** born on 14th October 1687 was a Scottish mathematician and professor of mathematics at the University of Glasgow. The pedal line of a triangle is sometimes called the “Simson line” after him.

Also, he has spent a lot of time helping translating important geometry books from Greek or Latin to English, for example Euclid’s Elements.

(In the second photo you can see the Memorial to Robert Simson in West Kilbride cemetery; on the plate is written “To Dr. Robert Simson of the University of Glasgow, the Restorer of Grecian Geometry; and by his works, the great promoter of its study in the Schools. A Native of this Parish.” )

**2. Evangelista Torricelli **born on 15th October 1608 was an Italian physicist and mathematician, best known for his invention of the barometer, but is also known for his advances in Optics

He is also famous for the discovery of the Torricelli’s trumpet (also – perhaps more often – known as Gabriel’s Horn) whose surface area is infinite, but whose volume is finite. This was seen as an “incredible” paradox by many at the time, including Torricelli himself, and prompted a fierce controversy about the nature of infinity, also involving the philosopher Hobbes. It is supposed by some to have led to the idea of a “completed infinity”. Torricelli tried several alternative proofs, attempting to prove that its surface area was also finite – all of which failed.

**3. Abraham Nemeth **born on 16th October 1918 was an American mathematician and inventor. He was Professor of Mathematics at the University of Detroit Mercy in Detroit, Michigan. Nemeth was blind, and was known for developing a system for blind people to read and write mathematics.

Nemeth distinguished himself from many other blind people by being able to write visual print letters and mathematical symbols on paper and blackboards just like sighted people, a skill he learned as a child. Nemeth says that this skill allowed him to succeed in mathematics, during an era without much technology, during which even Braille was difficult to use in mathematics.

He developed the Nemeth Braille Code for Mathematics and Science Notation, which was published in 1952.

Nemeth is also responsible for the rules of MathSpeak, a system for orally communicating mathematical text. In the course of his studies, Nemeth found that he needed to make use of sighted readers to read otherwise inaccessible math texts and other materials. Likewise, he needed a method for dictating his math work and other materials for transcription into print. The conventions Nemeth developed for efficiently reading mathematical text out loud have evolved into MathSpeak.

**4. Demetrios Christodoulou **born on 19th October 1951 is a Greek mathematician and physicist, who first became well known for his proof, together with Sergiu Klainerman, of the nonlinear stability of the Minkowski spacetime of special relativity in the framework of general relativity.

He is a recipient of the Bôcher Memorial Prize, the highest award of the American Mathematical Society, for his work on the spherically symmetric scalar field as well as his work on the stability of Minkowski spacetime.

In 2011, he and Richard Hamilton won the Shaw Prize in the Mathematical Sciences,[11] “for their highly innovative works on nonlinear partial differential equations in Lorentzian and Riemannian geometry and their applications to general relativity and topology”.

**5. Thomas Bartholin **born on 20th October 1616 was a Danish physician, mathematician, and theologian.

He is best known for his work in medicine: the discovery of the lymphatic system in humans and for his advancements of the theory of refrigeration anesthesia, being the first to describe it scientifically.

**6. Christopher Wren **was a notable anatomist, astronomer, geometer, and mathematician-physicist, as well as an architect. He was a founder of the Royal Society (president 1680–82), and his scientific work was highly regarded by Isaac Newton and Blaise Pascal.

Google has used its latest animated doodle to celebrate the 382th anniversary of the birth of Sir Christopher Wren (and I believe it was such a good idea).

SOOOooo… ** Let us CELEBRATE the MATHEMATICIANS born in October Together!!! **Thank you for your support and cooperation so far! (check the other related posts: Celebrate Mathematicians part 1 and Celebrate Mathematicians part 2 )

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 week.