设n是一个正整数,定义了一类新的主弱内射性,称之为n-主弱内射性.利用这类新的性质给出了一些新的幺半群类的刻画.
Let n be a positive integer. A new kind of injectivity, namely n-principMly weakly injective act, is defined. Through this new property the characterizations of some new classes of monoids were given.