Tribute to Jacob T. “Jack” Schwartz by David Levin, Director General of the LEDAS Company

I recently came across the following tribute to Jack Schwartz by David Levin, a student of Academician Andrei Petrovich Ershov. I have mentioned Levin before. He is the Jewish student taken on by Ershov at a time when it was politically unwise to do so. Ershov, to his great credit, accepted Levin as a student, [...]