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单词 summation notation
释义

summation notation

The finite series a1+a2+…+an can be written, using the capital Greek letter sigma, as

Similarly, for example,

(The letter ‘r' used here is a dummy variable and so could be replaced by any other letter.) In a similar way, the infinite series a1+a2+…can be written as

The infinite series may not have a sum to infinity or limit but, if it does, the same abbreviation is also used to denote this limit

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更新时间:2025/5/20 9:29:19