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a \ni b
{\rm d}y(t) &=& \frac{\partial g}{\partial t}{\rm d}t + \frac{\partial g}{\partial x}{\rm d}x + \frac{1}{2}\frac{\partial^2 g}{\partial x^2}({\rm d}x)^2
K_{\rm I}=-\frac{3K}{8}\sqrt{\frac{\pi}{a}}\chi(1)
\sigma_{z}(x,0)=0 \quad (x>1)
\sigma_{z}(a-\rho,0)\sim \frac{K_{\rm I}}{\sqrt{2\pi\rho}}