The Lagrangian of the 3d quantum field theory
Comments: 6 pages, 2 figures, minor revision, published version
The Lagrangian of the 3d quantum field theory is studied. The Lagrangians of the 3d gauge theories and the spinorial gauge theories are compared. The graviton field theory is used to obtain the 3d Lagrangian. These results provide a better understanding of the relativistic 3d quantum field theory.