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ÒÐÓÝÓ×ØÒÑ ÖÓÛÒÚÔÓÝÓÒ ÓÒ ÔÖÓ ÞÁÁÁÓÒlnπ(n,2) = lnπ(n,1)+ln(1− 3 )n+2·8/26s13≈ lnπ(n,1)− 3 n ≈ lnπ(n,0)− 1 n − 3 nÆÝÒÒÖÑ×ÙÑÙÒØÖ ÐÑlnπ(n,k) ≈ lnπ(n,0)−k∑j=12k −1nÇÓÒÐÞÚÔÓØÔÖÓÚ×ØÔÖÓÞk∑∫ kÔÓÖÒ kºÎÐÑØÚÐknk jevelké(2k −1) ≈ (2k −1)dk = k(k −1) ≈ k 2j=10( )π(n,k) ≈ π(n,0)exp − k2nÇÔØ∆x = (2D∆τ) 1/2¸k = x/∆x = x/(2D∆τ) 1/2¸n = t/(2∆τ)(π(n,k) = c(x,τ) ≈ c(x,0)exp1µÓ×ØÒÑc(x,τ)º)− x24DτÈÓÒÓÖÑÐÞ´ÔÓÑÒ∫ π(x,τ)dx =