on the paper "On the essence of mixed computation" by S.S. Lavrov; enclosed is the author's information about confidential data used in this paper

from Leningrad programmers containing plenty of witty hints on Ershov's works. (With a hand-written Ershov's explanatory remark addressed to his mother.)

Invitation to join the Conference Program Committee

of the textbook manuscript "Fundamentals of informatics...", code 02-KI

to the "Concept of education informatization"

with congratulations from S.S.Lavrov. (With a hand-written Ershov's explanatory remark addressed to his mother.)

Covering letter and notes describing the author's view on the right approach to the course of informatics and teaching programming