Knyazev P N

Publications in Math-Net.Ru

1. A necessary and sufficient condition for the comparability of operators
   
   Uspekhi Mat. Nauk, 18:4(112) (1963),  151–153
2. A completely continuous perturbation of the Hill equation on the half-line
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1960, no. 3,  163–167
3. On the use of minimax properties in perturbation theory
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1959, no. 2,  94–100
4. On a condition of preservation by monotone functions of the order relation for operators
   
   Uspekhi Mat. Nauk, 14:5(89) (1959),  141–146