Coefficient

$$[{x}^{n}] S$$

The coefficient of ${x}^{n}$ in the formal polynomial or formal series $S$.

$$[{x}^{2}] \left( 7 x - \frac{{x}^{2}}{3} \right) = -\frac{1}{3}$$

Extraction of a coefficient.

Last updated: 2020-03-06 00:22:16