SICP is now in Russian! Part three

Translation of the third lecture from the course “Structure of Computer Program Interpretation”.

This is the most famous programming course in the last 25 years; since 1980 it has been read at MIT, and more recently something similar has been read at Berkeley.
The course has changed teachers and even the Scheme programming language in Python (in my opinion it’s completely in vain) and nevertheless the information that is given in this course remains very relevant at any time. I would compare this course with something very fundamental and important for programmers, such as mathematics or the theory of algorithms.
I would very much like programming in our country to be taught in this way.
Enjoy watching!

look at yandex video:
video.yandex.ru/users/ztarlitz/view/8

link to the tracker, there are all the translated lectures and a book in Russian:
rutracker.org/forum/viewtopic.php?t=3136495

previous lectures look in this direction:
habrahabr.ru/blogs/htranslations/103906
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UPD I translated three lectures and came to the conclusion that this work is not very relevant here, but it takes a lot of time and effort, so I stop translating SICP, at least indefinitely, I will do other translations, perhaps more interesting for you. . In the near future I intend to complete the Feynman translation.