sigma

[ sig-muh ]

Phonetic (Standard)IPA

noun

sigma

/ ˈsɪɡmə /

the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
maths the symbol Σ, indicating summation of the numbers or quantities indicated

sigma

/ sĭg′mə /

Origin of sigma¹

First recorded in 1600–10; from Latin, from Greek sígma

Origin of sigma¹

Greek, of Semitic origin; related to Hebrew samekh

Hence it is obvious that, except for very small values of σ, the simpler equation gives values sensibly identical with those of .

The different imaginable series Σ form evidently a physical continuum of which the number of dimensions is very great.

This series σ is therefore one of those which correspond to movements where the finger does not budge.

In this expression σ denotes the mass of unit of area of the film, and e the energy of unit of area.

Dynamical similarity requires that T/gσa be constant; or, if g be supposed to be so, that a varies as T/σ.

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