2009-11-09 tex練習 メモ [tex:\rho(r)=\left\{\begin{array}{l l}\frac{\overline{\rho} - \rho_{peek}}{r_0}r + \rho_{peek} & \text{ (0\le r\le r_0)} \\ \frac{\overline{\rho}r_0{^2}}{r^2} & \text{ (r_0