当我尝试在 LYX 中预览我的文章时,出现以下错误:
f\left(x\right)\triangleq \lim_{\delta x\rightarrow\infty}\frac{f \left(... The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined.
我相信它指的是\triangleq
符号。
我该如何修复它?