• 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.
• See Section 1.10.4, Section 1.10.4, Section 3.10.3 and Section 3.10.4.
• See also: \[Delta] , \[Del] , \[DifferentialD] , \[Eth] .