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ÖÓÛÒÚÔÓÝÓÒ ÓÒ ÔÖÓ Þ ÔÐÓØ»ÖÒÓÑÛк×℄´ËÑÓÐÙÓÛ׸Ò×ØÒµßÓ∆x×ÔÖÚÔÓÓÒÓ×ؽ»¾ Þ×∆τ×ÔÓ×ÙÒÙÒ ÓÒÇÚÓÞÒ×ÔÓÙúØÑÒØÖ ßÓ−∆x×ÔÖÚÔÓÓÒÓ×ؽ»¾ ÐÒÐÑØÒÚØÝ⇒Ù××ÓÚÓÒÓÖÑ τ/∆τ¸ØÚÒÓÑÖÓÙVarx =ÚnÖÓ´Þ×τ= n∆τµVarxÐÒÖÓÞÐÒ×σ =∆x 2= n∆x 2√n∆x 2 = ∆x1√ e −x2 /2σ 2 = 1√ [∆τ√2πσ 2πτ ∆x exp − −x22τ√]∆τ∆x 2·6/26s13ÓúÔÖÓ2D =∆x 2 /∆τØÓ×ÑÓc(x,τ)
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