Q-derivative
From specialfunctionswiki
The $q$-derivative is defined by $$\dfrac{\mathrm{d}_qf}{\mathrm{d}_qz}=\left\{ \begin{array}{ll} \dfrac{f(qz)-f(z)}{qz-z}, & \quad z \neq 0 \\ f'(0), & \quad z=0. \end{array} \right.$$
Properties
Relationship between q-derivative and derivative
q-derivative power rule
