mathjax

[szcf-weiya]

\DeclareMathOperator in the head

since Marcos does not support DeclareMathOperator, so try to also put the declaration in the header, such as

but there will be an extra space in the header,

[szcf-weiya]

try to set display:none; height:0px

not work, and actually the script would render as

[szcf-weiya]

an alternative way

refer to

• https://stackoverflow.com/questions/29884128/how-to-use-declaremathoperator-in-mathjax-configuration-file
• https://tex.stackexchange.com/questions/159357/alternative-for-declaremathoperator

also check their definitions

~$ latexdef -p amsmath DeclareMathOperator

\DeclareMathOperator:
macro:->\@latex@error {Can be used only in preamble}\@eha 


(in preamble)
\DeclareMathOperator:
\long macro:->\@ifstar {\@declmathop m}{\@declmathop o}

~$ latexdef -p amsmath operatorname

\operatorname:
macro:->\protect \operatorname  


\operatorname :
\long macro:->\@ifstar {\qopname \newmcodes@ m}{\qopname \newmcodes@ o}

but the star version * seems not work, even tried to escape * via \

[szcf-weiya]

mathop

it seems that \mathop can achieve the star version,

but it seems not to work in the mkdocs.

[szcf-weiya]

\hat f

\hat f_1(x)

\hat f_{\!1}(x)

but for inline math formula, one more \ is needed to escape \!. However, if there are two math formulas, it would problematic, such as

so no change for them