йо п б жгз гд дг а
йо п б жгз гд дг а
йо п б жгз гд дг а
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ÄÒÚÒÓÚÖÓÚÒ ×ØÚÚ×ÞÒÑÔÖÓ×Ø·Ò ÓÒÒ ÖÞÝXÒ 6πηR´ËØÓ×ÚÚÞÓÖµmẍ = −λẋ+X(t)Ò ×ÓÑxÙÔÖÚÑ ÓÒ ÃÓÙÐλ =×Ð〈X(t)X(t ′)〉 = Aδ(t−t ′ )¸〈X(t)〉 = 00md 22dt 2(x2 )−mẋ 2 = − λ d2dt (x2 )+XxÔÐÙÑÒÓÒÓÙ×ØÒÓÒÓØÙ〈X(t)x〉 =·10/26s13ÌÓÐÞõØmd 22dt 2〈x2 〉−kT = − λ d2dt 〈x2 〉ÌÓÝÞ ÔÖÓXº ÐÒÚ×дÞÒ ÑTµ¸Ú×ÑÙÐÐÔÓØÙÑÚÞØddt 〈x2 〉 = 2kTλ +conste−λt/m t→∞ kT = 2D, D =λ