The cover pebbling number for lexicographic product graphs and some strong product graphs were determined.
对一个图而言，满足此条件的最小的自然数即为此图的覆盖数。
Bipartite graphs with P-regular endomorphism monoids are characterized. P-regularity of the endomorphism monoid of lexicographic product of graphs is discussed.
刻划了具有P -正则自同态幺半群的二分图，讨论了字典序积图的自同态幺半群的P -正则性。
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