I'm deeply sad to know that Fyodor Tkachev has passed away. My father also has passed away the same month, same cause.
I've collaborated with Fyodor in 2017 doing corrections of (English) Algorithms and Data Structures by Professor Niklaus Wirth, and thanks to him I talked with both via camera and computer when he visited Fyodor in Moscow, it was such an honor for me! But since a year or so I can't found anymore that recent corrected version of AD that he sent me right after editing the pdf. I have it, if you want to publish it again on Informatika-21 pages.
I'm sorry to post in this thread in English (my native language is Spanish), two reasons: the other thread is closed, and I don't know Russian, I'm reading the forum through Google translate.
Sincerely yours, Prof Pablo Cayuela Argentina
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