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Well, жалко, but I can't say I'm surprised.
The connection is "Metamagical Themas".
You can see a brief description of Hofstadter's work at Wikipedia:...

Really? That's fantastic! I wonder if you've heard of Douglas Hofstadter?

It isn't. Desole.

it's -> its

But the same could be said of books etc. ..?
Still, a very logical answer, thank you :)

French ... I don't know why, but it always stuck in my mind. Perhaps I now know why...

In English also - tetrad. It isn't of Russian origin, I believe it's Greek.
OK I just checked dictionary.com - it is indeed Greek "tetras", Indo European root.
Which is why I always found it weird...