Sigma

Sigma (capital tiny Σ , σ , written at the end of the word), in Greek σῖγμα , of the Greek alphabet is the 18th letter.

It has also a “lunar” form Сс resulting from the uncial writing from which the С from the Cyrillic alphabet is resulting, which is worth also /s/, whereas the C of the Latin alphabet is a deformation of the Gamma (Γ) Greek.

In Greek old as in Greek modern, it decides /s/ as in French to know except front the sound ones - β - γ - μ where she decides /z/ (as in French desire )

Use

The capital Σ is a symbol used to note:
  • In Mathematical:
    • Σ is the Symbole of the nap,
    • In Calculabilité, the formulas \ Sigma_n belong to the arithmetic Hiérarchie and start with a it-exists .

Tiny the σ is a symbol used to note:

  • In Mathematical:
  • In Physical:
    • σ is the symbol of the electric Conductivité calculated in mho by Mètre
    • σ is the symbol of an old measuring unit, being worth a Microseconde
    • σ is the symbol of the mechanical constraint expressed out of Pa (N/m ²)

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