Russian ⇄ English

мы сталкиваемся с проблемой stresses
math.	we are now faced with (having to get a bound, or at least a realistic estimate for F (x); ...); we are now faced with (having to get a bound, or at least a realistic estimate for F (x))
media.	challenge confronts us (bigmaxus)

мы сталкиваемся с проблемой: 1 phrase in 1 subject

Makarov

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