What is the "three easy"

"Three easy" means "lianshan yi", "the facts, the zhouyi, these three books, this is three different systems of yi-ology.All previous dynasties scholars generally believe that "lianshan yi" was written at the time of shennong boom in xia dynasty, is xia yi, it started with gen hexagrams symbolize the endless mountains;But the facts are easy on the yellow emperor period, thriving in the Yin, Yin yi, it starts from the kun hexagrams, symbol of all the facts in the earth;Zhouyi was written at the end of shells, thriving in the zhou dynasty, zhou dynasty is easy to learn, it starts from the qian and kun hexagrams, a symbol of all between heaven and earth and heaven.Now the lianshan yi "and" the facts easy "is already lost, we see today"The I ching", is actually the zhouyi.Also the scholar thinks, after jun of image-numberology, actually comes from the mountains is easy and the facts easily.Of course, this argument is also remains to be proven.But in any case, it at least, not only study of divination of the Chinese nation has a long history, and has developed into a very system, professional and academic.