Research on the Unified Law of Force Field Action Points of Four Fundamental Forces- Yan Zijie's Principle

This paper first proposed the Yan Zijie's principle. Through further in-depth research on the new gravitational field theory and the grand unified theory (GUT), it is demonstrated that the force field mutual action points of the four fundamental forces (gravitation, electromagnetic force, strong force, and weak force) are all located on the middle position of the line connecting the two object particles via the logical reasoning method, and are described by a concise mathematical expression. Combined with the gravitational mechanism formula proposed in the early stage and the research on the GUT, the understanding of the nature and laws of the four known fundamental forces in nature is further improved, providing new ideas and directions for the development of theoretical physics.