ROLE OF WAVE-FUNCTIONS NODAL SURFACES IN INTERPRETATION OF THE PAULI PRINCIPLE

Analysis of the relationship between the structure of the symmetrical permutation group and the topological structure of the configuration s pace makes it possible to perform complete separation of spin and spat ial variables for multielectron wave functions. This separation of var iables allows one to explain the role of nodal surfaces in interpretin g and understanding the physical sense of the Pauli principle for syst ems of fermions. The suggested hypothesis about the form of the nodal surfaces permits one to find these surfaces a priori for arbitrary mul tielectron systems. The use of nodal surfaces for constructing trial w ave functions is demonstrated by the example of calculating the energy of the Li atom in the ground state.