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Mechanics
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S /R
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Commission for Mathematical Education under the Presidium of the Academy of Sciences of the U.S.
S.R
.
комиссия по математическому образованию при президиуме АН СССР
simultaneous values of r and s
пара чисел r и s
we may suppress the accents on r' and s'
мы можем опустить штрихи у r' и s'
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