# A Particular Residue Formula

1. Sep 20, 2004

### Alamino

Is there a simple formula for the residue of

$$\frac{e^{ik}}{\prod_j (k-is_j)}$$

where $$s_j$$ are constants ?

2. Sep 20, 2004

### Tide

I assume your variable of integration is k - correct accordingly if it is not. The residue will be just the sum over n of
$$\frac{e^{s_n}}{\prod_{j \neq n} (i s_n-is_j)}$$

3. Sep 21, 2004

### Alamino

Thank you, that's exactly what wanted.