sigma

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sigma (Wikipedia approfondimento) m e f inv

  1. diciottesima lettera dell'alfabeto greco rappresentata dal simbolo Σ, σ (in posizione non finale), ς (in posizione finale), corrispondente alla lettera S, s dell'alfabeto latino
  2. (matematica) simbolo della sommatoria
sìg | ma

dal greco σίγμα o σῖγμα s dal latino sigma

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