Indefinite sum

（重定向自Antidifference）

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

单词	Antidifference
释义	Antidifference 英语百科 Indefinite sum （重定向自Antidifference） 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
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