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摘要
After showing the downwards density of nonhemimaximal degrees. Downey and Stob continued to prove that the existence of a low(2), but not low, nonhemimaximal degree, and their proof uses the fact that incomplete in-topped degrees are low(2) but not low. As commented in their paper. the construction of such a nonhemimaximal degree is actually a primitive 0%26apos;%26apos;%26apos; argument. In this paper, we give another construction of such degrees, which is a standard 0 %26apos;%26apos;-argument, much simpler than Downey and Stob%26apos;s construction mentioned above.
- 出版日期2012-6
- 单位南阳理工学院
