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| has gloss | eng: In mathematics the indefinite sum operator (also known as the antidifference operator), denoted by \sum _x \, or \Delta^-1} \,, is the linear operator, inverse of the forward difference operator \Delta \,. It relates to the forward difference operator as the indefinite integral relates to the derivative. Thus |
| lexicalization | eng: indefinite sum |
| instance of | c/Linear operators in calculus |
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