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右推出左推不出、左推出右推不出

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kuing posted 2023-9-28 15:54 |Read mode
Last edited by kuing 2023-11-6 04:44from: zhihu.com/question/622677788/answer/3217032851
我的回答:
  1. \documentclass{article}
  2. \usepackage{amsmath}
  3. \usepackage{amssymb}
  4. %右推出、左推不出
  5. \newcommand\rtc{\mathrel{\vcenter{
  6. \ialign{##\crcr
  7. $\Rightarrow$\crcr
  8. \noalign{\nointerlineskip\vskip2pt}
  9. $\nLeftarrow$\crcr}}}}
  10. %左推出、右推不出
  11. \newcommand\ltc{\mathrel{\vcenter{
  12. \ialign{##\crcr
  13. $\nRightarrow$\crcr
  14. \noalign{\nointerlineskip\vskip2pt}
  15. $\Leftarrow$\crcr}}}}
  16. \begin{document}
  17. $A \rtc B \ltc C$
  18. \end{document}
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