Israeli immigrant solves 38-year-old math problem
Prof. Avraham Trakhtman, an Israeli mathematician from the Department of Mathematics and Computer Science at Bar Ilan University, proposes another solution: it comes by way of a 38-year-old math puzzle known as the “Road Coloring Problem,” which he recently solved.
…
Known by his Israeli colleagues as a modest man, Trakhtman’s life is a bit of a Cinderella story. Now 63, and originally from Yekaterinburg, Russia, he came to Israel in 1992 as a new immigrant looking to build a better life.
Although he was an accomplished mathematician in Russia, the first jobs he could find in Israel included maintenance work and a stint as a security guard.