"Z(MSM 153100011)" . . . "Upper and Lower Solutions and Topological Degree" . "17"^^ . "Rach\u016Fnkov\u00E1, Irena" . "Journal of Mathematical Analysis and Applications" . "757028" . "Upper and Lower Solutions and Topological Degree"@en . "[90A18B1B00D4]" . . "Upper and Lower Solutions and Topological Degree" . "RIV/61989592:15310/99:00000862!RIV/2000/MSM/153100" . "The relation between the topological degree and strict upper and lower solutions is presented. Existence and multiplicity results for linear and nonlinear boundary value problems are obtained in this way." . "0022-247X" . "RIV/61989592:15310/99:00000862" . "Upper and Lower Solutions and Topological Degree"@en . "The relation between the topological degree and strict upper and lower solutions is presented. Existence and multiplicity results for linear and nonlinear boundary value problems are obtained in this way."@en . "1"^^ . "Rach\u016Fnkov\u00E1, Irena" . . . "N" . "311" . . . . . . "1"^^ . . "15310" . "234" .