本文通过对一类含有3个圈的双色有向图进行着色,研究了各种着色情况下的本原性及本原指数,得到了本原指数的紧的上界.
By coloring a special two-colored digraphs whose uncoloed digraph consists of 3 cycles,we discuss their primitive and exponent and get the tight upper bound on the exponents.