Question 182900
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There is only one condition:


For 


*[tex \LARGE \text{          }\math p > 0 \text{ and }\math \{y_i | y_i < 0, 1 \leq i \leq n\}]


*[tex \LARGE \text{          }\math p + \sum_{i=1}^n y_i > 0 \ \ \Leftrightarrow\ \ \left|\sum_{i=1}^n y_i \right| < p] 



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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