位于今四川乐山城东凌云寺藏经楼右边院墙外的注易洞,是明代中后期嘉州易学象数派学人为探讨《周易》奥秘而留下的遗迹。现经整修的注易洞,因沿悬崖外接屋檐1米许,遂使其呈现为不规则的“凸”字形,计面阔近10米,左翼深2米有余,右翼深2米不足,中部主洞宽约5米,进深6 Located at the right wall of the Lingshan Temple of Lingshan in Leshan, Sichuan, the cave of Yiyuan at the right hand side of the courtyard is the remains left by the Jiazhou Yi School of Mathematics in the late Ming Dynasty for discussing the mysteries of the Book of Changes. Now refurbished Note Yi Dong, due to the cliff along the eaves 1 m Xu, then make it appear irregular “convex ” glyph, meter wide and nearly 10 meters deep left more than 2 meters, less than 2 meters deep right , The main central hole width of 5 meters, depth 6