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Very weak assumptions. It's Kazakhstan. You might find it surprising but not the whole world is US-centric. They mainly publish in Russian, he probably have strong connections with russian institutes and unless you can access/check/verify publications in russian, your opinion is quite out of place.

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Which assumptions were weak? I'm not sure what the comment has to do with the US, but the Russophone world is well aware of the importance of this problem to the effect that one would expect news of any consensus on the validity of this approach to percolate to the Anglophone world almost immediately. My Russian is pretty terrible, but my math is decent enough, and the article spends at least the first 12 pages motivating the problem and defining standard notions that any undergraduate should be familiar with. This is another red flag.

I was surprised by the long motivation aswell. OTOH, spending 12% of a paper with the motivation does not sound excessive. That said, I don't understand much, due to not knowing Russian and not in depth knowledge about the topic.

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