M. N. Yakovlev, “Solvability of a periodic boundary-value problem for a system of first-order ordinary differential equations with <nobr>$(\beta,\gamma,\delta)$</nobr>-comparison pairs”, Zap. Nauchn. Sem. POMI, 1998, Volume 248,Pages <nobr>231

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Solvability of a periodic boundary-value problem for a system of first-order ordinary differential equations with $(\beta,\gamma,\delta)$-comparison pairs

M. N. Yakovlev

St. Petersburg Department of V. A. Steklov Institute of Mathematics, Russian Academy of Sciences

Abstract: Existence theorems are proved for an incomplete set of upper and lower functions.

UDC: 519

Received: 03.11.1997