User:Harryboyles/Epsilon


 * Hilbert introduced epsilon terms $$|\epsilon x.\phi$$ as an extension to first-order logic; see epsilon calculus.
 * it is used to represent the Levi-Civita symbol.
 * it is used to represent dual numbers: $$a+b \varepsilon$$, with $$|\varepsilon^{2}=0$$ and $$|\varepsilon \neq 0$$.