Geodesic
On a Bifurcation Theorem of Hopf and Friedrichs*
Canadian mathematical bulletin, Tome 20 (1977) no. 1, pp. 95-102

Voir la notice de l'article provenant de la source Cambridge University Press

For the autonomous system x' = F(x,∊), the case where the second Hopf-Friedrichs condition fails is analyzed in that sufficient conditions for bifurcation of non-trivial periodic solutions to occur are given. An application to mathematical ecology is also discussed. 
Freedman, H. I. On a Bifurcation Theorem of Hopf and Friedrichs*. Canadian mathematical bulletin, Tome 20 (1977) no. 1, pp. 95-102. doi: 10.4153/CMB-1977-016-x
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