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finite_sum_of_complex_numbers [2014/01/29 19:55] nikolaj |
finite_sum_of_complex_numbers [2014/01/29 19:55] nikolaj |
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| ==== Discussion ==== | ==== Discussion ==== | ||
| === Theorem === | === Theorem === | ||
| - | ^ $\sum_{k=1}^n z^k=\frac{z^{n+1}-1}{z-1}$ ^ | + | ^ $\sum_{k=1}^n z^k=\frac{1}{z-1}(z^{n+1}-1)$ ^ |
| ==== Parents ==== | ==== Parents ==== | ||
| === Subset of === | === Subset of === | ||
| [[Finite sum over a monoid]] | [[Finite sum over a monoid]] | ||
