日志上的加号

Question

我怎样才能在函数上加一个加号\log？我必须翻译一篇博士论文，那里有一个这样的符号。

Answer 1

我会少举 + 而不是简单的\overset：

\documentclass{article}
\usepackage{amsmath,mathtools}

\DeclareMathOperator{\logplus}{\overset{+}{\vphantom{g}\smash{\log}}}

\begin{document}

Comparison with the possible originally used construction
and the proposed one
\[
\overset{+}{\log}_{k+1}T
\qquad
\logplus_{k+1}T
\]
Now the formula; first in the probable original format
\[
\varrho^{(k)}(f):=
\varlimsup_{r\to\infty}\frac{\overset{+}{\log}_{k+1} T(r,f)}{\log r}
\]
and then in the proposed one
\[
\varrho^{(k)}(f)\coloneqq
\varlimsup_{r\to\infty}\frac{\logplus_{k+1} T(r,f)}{\log r}
\]
The $+$ sign is raised less as much, and the $T$ is correctly
spaced from the operator.

\end{document}

Answer 2

\DeclareMathOperator{\plog}{}与堆叠一起使用。可以使用{1pt}参数调整重叠高度。

\documentclass{article} % Adjust the font scale/size here
\usepackage{amsmath,stackengine}
\DeclareMathOperator{\plog}{%
  \ensurestackMath{\stackengine{1pt}{\log}{\scriptstyle+}{O}{c}{F}{F}{S}}}
\begin{document}
\[
\varlimsup_{r\rightarrow\infty} \frac{\plog_{k+1}T(r,f)}{\log r}
\]
\end{document}

Answer 3

如果你输入\log\limits^+，那么你就会得到你想要的。