f is by default interpreted as Del[f]. Used in vector analysis to denote gradient operator and its generalizations. Used in numerical analysis to denote backward difference operator. Also called nabla. Not the same as \[EmptyDownTriangle]. See The Mathematica Book: Section 3.10.3, Section 3.10.4. See also: \[CapitalDelta], \[PartialD], \[Square].
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\[Del]
del
