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Finite sum of complex numbers
Set
| $ (z_i) \in \mathrm{FinSequence}(\mathbb C)$ |
| $ n=\mathrm{length}((z_i)) $ |
| $\sum: \mathrm{FinSequence}(\mathbb C)\to \mathbb C$ |
| $\sum_{i=1}^n\ z_i:= \begin{cases} 0 & \mathrm{if}\ n=0\\\\ \left(\sum_{i=1}^{n-1}\ z_i\right)\ +\ z_n & \mathrm{else} \end{cases}$ |
Discussion
Theorem
| $\sum_{k=1}^n z^k=\frac{z^{n+1}-1}{z-1}$ |
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Parents
Subset of
