Is Yuan You's blessing written wrong?

Wrong. According to the query of Mathematics Newspaper, Yuan You's writing is wrong, and Yuan You's is correct, which is a common-sense mistake. Yuan You was Zhao Xu's first title in Song Zhezong, which was used for nine years in the Northern Song Dynasty. Because the old party opposed to the New Deal was in power in Yuan You, the word Yuan You was used to refer to the old party and its members in later party struggles.