从易学发展史来看,易学主要分为象数派和义理派。在不同的时期、不同的学派对“象数”、“义理”有不同的界定。虽然人们通常把“象数”、“义理”对应来提,但实际上“象”和“数”是两个不同的概念,见《左传.僖公十五年》:“龟,象也;筮,数也。物生而后有象,象而后有滋,滋而后? From the history of Yi learning, Yi learning is mainly divided into elephant and justice school. In different periods, different schools have different definitions of “figure” and “justice”. Although people generally refer to “the number of figures” and “justice” as their counterparts, actually “elephant” and “number” are two different concepts. See “Zuo Zhuan and Gong Gong for fifteen years” ; 筮, the number also. After birth, there are elephants, elephants and later, nourishing and then?