https://simplis.com/documentation/simetrix/script_manual/topics/func_diff.htm
SIMetrix Script Manual: diff Function
Returns the derivative of the argument with respect to its reference. If the argument has no reference the function returns the derivative with respect to the...
manual diffscriptfunction
https://www.php.net/manual/zh/ds-map.diff.php
PHP: Ds\Map::diff - Manual
Creates a new map using keys that aren't in another map
phpmapdiffmanual
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https://www.php.net/manual/en/datetime.diff.php
PHP: DateTimeInterface::diff - Manual
Returns the difference between two DateTime objects
phpdiffmanual
