**Epsilon - Wikipedia**
https://en.wikipedia.org/wiki/Epsilon

More items... (particularly calculus ), an arbitrarily small positive quantity is commonly denoted ε; see (ε, δ)-definition of limit. Hilbert introduced epsilon terms ϵ x . ... it is used to represent the Levi-Civita symbol. it is used to represent dual numbers: a + bε, with ε2 = 0 and ε ≠ 0. it is sometimes used to denote the Heaviside step function.

(particularly calculus ), an arbitrarily small positive quantity is commonly denoted ε; see (ε, δ)-definition of limit.

Hilbert introduced epsilon terms ϵ x . ...

it is used to represent the Levi-Civita symbol.

it is used to represent dual numbers: a + bε, with ε2 = 0 and ε ≠ 0.

it is sometimes used to denote the Heaviside step function.

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