. . . "Avraham Naumovich Trahtman (Trakhtman) (Russian: \u0410\u0431\u0440\u0430\u043C \u041D\u0430\u0443\u043C\u043E\u0432\u0438\u0447 \u0422\u0440\u0430\u0445\u0442\u043C\u0430\u043D; b. 1944, USSR) is a mathematician at Bar-Ilan University (Israel). In 2007, Trahtman solved a problem in combinatorics that had been open for 37 years, the Road Coloring Conjecture posed in 1970."@en . "Avraham Naumovich Trahtman"@en . . . . "Trahtman, Avraham"@en . . . "1944-02-10Z"^^ . . . . "Israeli mathematicians" . "1944Z"^^ .