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PP/Pt=dP/du*Pu/Pt=dP/du*¦È*(-1/2)*t^(-3/2)
PP/P¦È=dP/du*Pu/P¦È=t^(1/2)*dP/du
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D*dy/du+1/2*u*y=0
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Lny=LnA'-1/(4*D)*u^2
y=dP/du=A'*e^[-1/(4*D)*u^2]
P=B+Integral{A'*e^[-1/(4*D)*¦Î^2]*d¦Î ,0,u}
=B+A'' *Integral{e^[-¦Ç^2]*d¦Ç£¬0£¬¦È/[2*sqrt(D*t)]}
=B+A*erf{¦È/[2*sqrt(D*t)]}
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