在數學式中 常常會有畫箭頭消去的符號 目前我已經找到 \cancelto ↗ \cancel ／ \bcancel ＼ \xcancel ╳ http://www.sosmath.com/CBB/viewtopic.php?t=9412 但一直找不到長相是這樣↘的消去符號 不知道有沒有人知道他的code >"< 另外 如果想要幫這些消去符號上色 但是底下文字不上色的話 請問我要怎麼寫呢 謝謝!!! 以下附上我的原始檔 \documentclass[12pt]{report} \usepackage{graphicx} \usepackage{amsmath} \usepackage{geometry,array,cancel} \usepackage[dvips]{color} \usepackage{colortbl} \parindent=0mm \begin{document} \begin{eqnarray*} % \nonumber to remove numbering (before each equation) \lefteqn{S^y S^z + S^z S^y} \\ &=& \left[\frac{\sqrt{3}}{2}\mbox{II}\otimes \sigma_y+\frac{1}{2}\left(-\sigma_x \otimes \sigma_y +\sigma_y \otimes \sigma_x\right)\right]\cdot \left[\sigma_z \otimes \mbox{II}+\frac{1}{2}\mbox{II}\otimes \sigma_z\right] \\ && \left[\sigma_z\otimes\mbox{II}+\frac{1}{2}\mbox{II}\otimes \sigma_z\right]\cdot \left[\frac{\sqrt{3}}{2}\mbox{II}\otimes \sigma_y+\frac{1}{2}\left(-\sigma_x \otimes \sigma_y+\sigma_y \otimes \sigma_x\right)\right]\\ &=& \frac{\sqrt{3}}{2}\mbox{II}\sigma_z\otimes\sigma_y \mbox{II}+\frac{\sqrt{3}}{4}\mbox{II II}\otimes \sigma_y \sigma_z+\frac{1}{2}\left(-\sigma_x \sigma_z \otimes \sigma_y \mbox{II}+\sigma_y \sigma_z \otimes \sigma_x \mbox{II}\right)\\ && +\frac{1}{4}\left(-\sigma_x \mbox{II}\otimes \sigma_y \sigma_z+\sigma_y \mbox{II}\otimes \sigma_x \sigma_z\right)+\frac{\sqrt{3}}{2}\sigma_z \mbox{II}\otimes \mbox{II}\sigma_y +\frac{\sqrt{3}}{4}\mbox{II II}\otimes \sigma_z \sigma_y \\ && +\frac{1}{2}\left(-\sigma_z \sigma_x \otimes \mbox{II}\sigma_y + \sigma_z \sigma_y \otimes \mbox{II}\sigma_x\right)+\frac{1}{4}\left(-\mbox{II}\sigma_x \otimes \sigma_z \sigma_y + \mbox{II}\sigma_y \otimes \sigma_z \sigma_x\right) \\ && *~ \sigma_y \sigma_z = i \sigma_x;~\sigma_x \sigma_z =-i\sigma_y;~\sigma_z \sigma_y=-i\sigma_x;~\sigma_z \sigma_x=-i\sigma_y\\ &=& \frac{\sqrt{3}}{2}\sigma_z \otimes \sigma_y +\frac{\sqrt{3}}{4}\cancelto{}{\mbox{II}\otimes i\sigma_x}+\cancelto{}{\frac{1}{2}i\sigma_y\otimes \sigma_y}+\frac{1}{2}\cancelto{}{i\sigma_x\otimes \sigma_x}+\frac{1}{4}\left(\xcancel{-\sigma_x\otimes i \sigma_x} + \xcancel{\sigma_y \otimes \left(-i\sigma_y\right)}\right)\\ && +\frac{\sqrt{3}}{2}\sigma_z\otimes \sigma_y+\frac{\sqrt{3}}{4}\cancelto{}{\mbox{II}\otimes \left(-i\sigma_x\right)}+\frac{1}{2}\left(\cancelto{}{-i\sigma_y\otimes \sigma_y} + \cancelto{}{\left(-i\sigma_x\right)\otimes \sigma_x}\right)\\ && +\frac{1}{4}\left(\xcancel{-\sigma_x\otimes \left(-i\sigma_x\right)}+\xcancel{\sigma_y \otimes i\sigma_y}\right)\\ &=& \sqrt{3}\sigma_z \otimes \sigma_y \end{eqnarray*} \end{document} --

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