While holding component parts by fixtures the machining errors will be engendered on workpieces owing to a lot of reasons.When designing fixtures we ought to utilize flexibly the "error inequality"to distribute and control reasonably the magnitude of each error in order to make the fixture be able to assure reliably the accuracy requirements of component parts being machined.
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There are convex function and concave function, Which are of expansive application in many aspects, especially in inequality proof and error estimate.
凸(凹)函数有很多特性，这些性质可广泛应用于不等式的证明及误差估计等方面。
In the person identification part, we construct databases of biometrical features around the eye area of clients and, for authentication, Schwartz inequality and the sum square error (SSE) are used.
在身份识别这一部分，首先构建客户眼睛周边区域的生物特征数据库用于进行身份验证。在身份验证阶段使用了施瓦茨不等式算法和误差平方和（SSE）算法。
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