The answer to "Jiang Taigong looking for mathematical expressions" is: common vertical line. Answer: According to the riddle, fishing can be understood as a "vertical line" and "Jiang Taigong fishing" can be understood as an "ordinary vertical line". In this riddle, "Jiang Taigong fishing" is a riddle, "playing with a mathematical term" is a riddle, and the answer is vertical.

A Fish Jumping into a Hookless Baitless Fishing Line in Jiang Taigong

During the Shang and Zhou Dynasties, Jiang Taigong Ziya was ordered by his master to help Zhou Wenwang overthrow tyranny. Jiang Ziya felt that he had been half a century, and he had no friendship with King Wen, so it was difficult to gain the appreciation of King Wen. So on the way back to Beijing, King Wen fished without bait with a straight hook on one side of the river.

Fish hooks are generally curved, but Jiang Ziya used a straight hook (not a hook) instead of bait. King Wen saw it and thought it was a strange man (the ancients respected him very much), so he took the initiative to talk to him and found that he was really a useful talent, so he confessed. Later, Jiang Ziya helped King Wen and his son overthrow the rule of Shang and Zhou Dynasties and established the Zhou Dynasty.