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ε (EN)
lettre, symbole

lettre “ε”

ε, epsilon
  1. la cinquième lettre de l'alphabet grec (epsilon)
    In Greek writing, words like "ἐλπίς" (hope) begin with an ε.

symbole “ε”

ε
  1. (mathématiques) un nombre positif arbitrairement petit
    In calculus, we let ε be as small as needed to make the function values close to the limit.