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Hybrid solution of the problem
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Journey to the world of mathematics on Tchebyshev’s plantigrade machine
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"Ну и рожа у тебя, Шарапов!"
New edition - after 20 years!
One more...
Chebyshev Step Machine
I have a dream to built the Tchebyshev’s plantigrade machine and go from my dacha to the Thebyshev's born place: