V. F. Tkachev, “New sufficient conditions for stability, semistability and instability of the limit cycle of the <nobr>$\frac{dy}{dx}=\frac{P(x,y)}{Q(x,y)}$</nobr> equation”, Dokl. Akad. Nauk SSSR, 1957, Volume 116, Number 4,Pages <nobr>564

MATHEMATICS

New sufficient conditions for stability, semistability and instability of the limit cycle of the $\frac{dy}{dx}=\frac{P(x,y)}{Q(x,y)}$ equation

V. F. Tkachev

Voronezh State University

Presented: P. S. Aleksandrov
Received: 18.04.1957