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西格玛是希腊字母Sigma的中文音译，大写Σ，小写σ，是第十八个希腊字母。 在现代的希腊数字代表200。 其大写符号在数学中常表示求和符号，其大小写符号在数学各细分方向也有不同的含 …

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Format Mirrorless 61 DSLR 26 Mount L-Mount 61 Sony E 63 Canon RF 9 Nikon Z 3 Canon EF 26 Nikon F 25 Canon EF-M 3 Sigma SA 24 Sony A 3 Fujifilm X 10 Micro 4/3 3 Pentax 2 Sensor …

In number theory, σ is included in various divisor functions, especially the sigma function or sum-of-divisors function. In applied mathematics, σ (T) denotes the spectrum of a linear map T.

Sigma (Σ, σ) 是希腊字母表的第十八个字母。 在希腊数字系统中，它的值为 200。 在一般数学中，大写 Σ用作求和的运算符。

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