Letter The author writes about his work “On transformation of programs written in Algol” written under the influence of the paper by Ershov and Lyapunov “On formalization of the ‘program’ notion” and asks Ershov for his opinion. Date: 16.02.1969 Original document language: russian Authors: Anatoli I. Lukash Persons: Alexei A. Lyapunov, Svyatoslav S. Lavrov Addressee: Andrei Petrovich Ershov
