Manual:$wgMathDirectory

TeX: $wgMathDirectory
The file system path of the directory containing LaTeX math images.
Introduced in version:pre 1.1.0
Removed in version:1.18.0
Allowed values:(absolute path)
Default value:"{$wgUploadDirectory }/math"
(Note: The default value of this variable depends on other variables, such as the values set in Setup.php , after LocalSettings.php is executed)

Details edit

The file system path of the directory containing LaTeX math images.