Huaxia, Huaqing University, Qiuzhai.
Elder Yuan, who is the same age as the Republic, is already eighty-six years old and has been completely retired for more than five years. Fortunately, his health is still relatively good, but his visits to Huaqing have become less frequent.
Every time he comes, there's nothing much to do. The main purpose is to see Qiao Yu at Qiuzhai, and today is no exception.
The old man is stubborn by nature, always feeling that asking Qiao Yu to come to his home is disrespectful to his precious grand-disciple.
Before he retired, Qiao Xi finally graduated with a master's degree from Huaqing. The topic of her graduation thesis was "Research on the Existence of Solutions for Nonlinear Partial Differential Equations Based on the Qiao Algebra Method."
In the current academic world, Qiao Algebra specifically refers to the algebraic system of generalized modal axioms.
