\geqslant Latex 中未定义的控制序列
当我编译以下乳胶代码时:
\begin{align}
f_{m}(x) = c_{1,m} \times I(x_{i}^{m} \geqslant t_{m} ) + c_{2,m} \times I(x_{i}^{m} < t_{m} ),
\end{align}
我总是收到错误:
! Undefined control sequence.
<argument> ..._{1,m} \times I(x_{i}^{m} \geqslant
t_{m} ) + c_{2,m} \times I...
l.124 \end{align}
当我用 >= 替换 \geqslant 时,就可以了。
我已经包含了 amsmath 包。什么会导致问题?
谢谢和问候!
When I compile the following latex code:
\begin{align}
f_{m}(x) = c_{1,m} \times I(x_{i}^{m} \geqslant t_{m} ) + c_{2,m} \times I(x_{i}^{m} < t_{m} ),
\end{align}
I always get an error:
! Undefined control sequence.
<argument> ..._{1,m} \times I(x_{i}^{m} \geqslant
t_{m} ) + c_{2,m} \times I...
l.124 \end{align}
When I replace \geqslant with >=, it is okay.
I already include the amsmath package. What would cause the problem?
Thanks and regards!
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该命令不是在 amsmath 包中定义的,而是在 amssymb 包中定义的 - 将
\usepackage{amssymb}
放在序言中,应该没问题。That command isn't defined in the amsmath package, but rather the amssymb package -- put
\usepackage{amssymb}
in your preamble and you should be fine.