Zhao Yi had been prepared for Zhang Qican, Huang Zhong, and Ruan Wenye to struggle with quickly comprehending the new formulations, as the difficulty was indeed quite high.
The content of the theory had all been researched by him, but it skipped many tiny details from the "Law of Cause and Effect" and other capabilities, making it really challenging for anyone trying to deduce and understand them slowly.
Zhao Yi's understanding of the content was also based on causality thinking, using logical reasoning to deduce slowly, and there was simply too much content.
This was probably because the theories about space were all researched by him, without undergoing a systematic organization.
The mathematics and physics one can learn nowadays all have many formulas and definitions, which means learning is based upon the foundation laid by predecessors, without having to trace the origin of every formula and definition.
The theories on space are different.