SIGMA

lastmod 2018-08-17created 2014-11-124 edits

In mathematics, sigma (SIGMA; Σ) denotes the sum of a sequence.

Sigma (σ) is used as follows.

• In physics, the proportionality constant of the Stefan–Boltzmann law.
• In mathematics, the divisor function.
• In statistics, the standard deviation.
• In chemistry, a sigma bond between atoms.
• In solid mechanics, stress.
• In atmospheric science, the absorption coefficient.
• In nuclear engineering, the cross section.
• In linguistics, the symbol for each individual syllable when drawing syllable tree diagrams.