Who Is It?

I thought it would be fun to have a "Who is it?" with each newsletter as this can help us either refresh our memories or help us to learn about great scientists that have contributed to so many aspects of our world! I hope you enjoy!

A Russian Mathematician during the 1800's whose greatest achievement was the development of non-Euclidean Geometry, subsequently called hyperbolic geometry. M. C. Escher's famous prints Circle Limit III and Circle Limit IV help visualize the use of hyperbolic geometry. This professor of mathematics and physics was also developing a method for the approximation of the roots of algebraic equations — later known as the Dandelin-Graffe method.

Do you know who this man was?