\varsigmaThe Greek letter \varsigma is a variant of the lowercase sigma (σ) used in mathematical contexts. It is often used to represent a specific form of the sigma symbol, particularly in contexts where a distinction between different forms of sigma is necessary, such as in certain mathematical proofs or equations.
Using \varsigma in an integral equation to denote a specific form of sigma.
\varsigma = \int_{a}^{b} f(x) \, dxRepresenting the sum of a series with \varsigma as a variant of sigma.
\sum_{i=1}^{n} a_i = \varsigmaUsing \varsigma in a derivative equation to denote a specific function or variable.
\varsigma(x) = \frac{d}{dx} \varsigma