Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Wu or Wu (Hao) style of t''ai chi ch''uan of Wu Yu-hsiang of Wu Chien-ch''üan. Wu Yu-hsiang''s style was third among the five t''ai chi ch''uan families in seniority and is fifth in terms of popularity. Wu Yu-hsiang was a scholar from a wealthy and influential family who became a senior student (along with his two older brothers Wu Ch''eng-ch''ing and Wu Ju-ch''ing) of Yang Lu-ch''an. There is a body of writing attributed to Wu Yu-hsiang on the subject of t''ai chi theory, writings that are considered influential by many other schools not directly associated with his style. Wu Yu-hsiang also studied for a brief time with a teacher from the Ch''en family, Chen Ch''ing-p''ing, to whom he was introduced by Yang. His most famous student was his nephew, Li I-yü , who also authored several important works on t''ai chi ch''uan. Li I-yü had a younger brotherwho was also credited as an author of at least one work on the subject of t''ai chi ch''uan, Li Ch''i-hsüan.