What is "copulative"

The so-called "copulative", refers to theThe I ching"An introduction to the whole.Thanks to the "copulative", so, with the core content of divination of yi jing, it is no longer just a book of divination, but be promoted to the height of philosophy, and become a very important work in the history of Chinese philosophy.The so-called "copulative", originally refers to king wen of zhou;"Lines" originally refers to the hexagrams and the back of the hexagram "GuaCi" and "" cha ages developed to, and here it refers to the explanation of Confucius department after the yi jing, also known as the" big ".