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1·But as the output variables and the prime implicant grow up, both the long processing time and the resource requirement become the major problems to be resolved with the extraction method.

选拔算法是两级逻辑综合中求解最小化覆盖的经典方法之一，但在输出变量集合和质立方体集合规模较大的情况下，采用选拔法求最小化覆盖存在空间复杂度高、求解时间长等问题。

2·By means of Boolean matrix operation method, a study is made of defining the prime implicant of multi output function and the operation routine of the method is illustrated with some examples.

运用布尔矩阵运算的方法对确定多输出函数的质蕴涵进行了研究，并通过示例说明了这种方法的运算程序。