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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.

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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义。

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 Coverage Full …

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Canon EF-M mount Canon RF Mount FUJIFILM X Mount Micro Four Thirds mount Nikon Z mount Sony E-mount SIGMA SA-mount Canon EF mount Nikon F mount Pentax mount Sony A-mount SENSOR …

Sigma (disambiguation) Look up sigma, Sigma, Σ, σ, or ς in Wiktionary, the free dictionary. Sigma (Σ or σ, word-final lowercase ς) is the 18th letter of the Greek alphabet. Sigma may also refer to: