Der topologische Abbildungsgrad für vollstetige Vektorfelder zum Nachweis von periodischen Lösungen. (German) Zbl 0182.42102
Keywords:
ordinary differential equationsReferences:
[1] | Villari, Ann. Mat. pura appl. Ser. 4 69 pp 171– (1965) |
[2] | Topologische Methoden in der Theorie der nichtlinearen Integralgleichungen, Moskau 1956. · Zbl 0070.33001 |
[3] | und , Qualitative Theorie nichtlinearer Differential-gleichungen, Rom 1963. |
[4] | Reissig, Deutsch. Akad. Wiss. Berlin 6 pp 407– (1964) |
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