ABSTRACT
The correct account of all really essential factors for a physical problem is called physical rigor. Physical rigor is necessary for solving physical problems as common mathematical rigor does for solving the problems of the analysis. One of the most important and difficult questions in each particular field of theoretical physics is to what extent the requirements of physical and mathematical rigor are satisfied when the problems in a given field are posed and solved. An investigation of this kind is especially important in the field of laws of elementary physics — the field which is close to the theory of the structure of matter. However, the attempt to give such kind of analysis of physical rigor to the existing formulation of the elementary physical laws is out of the scope of this paper. I should like to dwell upon another question closely connected with it, i.e., upon the formation of a physical notion itself.
