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- Unicode: 2202.
- Alias:
 pd .
- Prefix operator with built‐in evaluation rules.
 is by default interpreted as D[y,x].  is used in mathematics to indicate boundary.  d gives \[Delta], not ∖[PartialD]. - You can use \[InvisibleComma] in the subscript to
 to give several variables without having them separated by visible commas.
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