10 A. CASTRO AND V. PADR
´
ON


d
1
λ
μ1
p−q
ν2
p−q
μ2
p−q
ν3
p−q
μ3
p−q
νn
p−q
μn
p−q
ψ2 ψ3 ψn
ξ1 ξ2 ξ3 ξn
Figure 4. Bifurcation curves defined by the functions ξj (contin-
uous line), and ψj (dotted line) for the case −1 q 1, p
N+2
N−2
.


d
D
1
λ
μ1
p−q
ν2
p−q
μ2
p−q
ν3
p−q
μ3
p−q
νn
p−q
μn
p−q
ψ2 ψ3 ψn
ξ1 ξ2 ξ3 ξn
Figure 5. Bifurcation curves defined by the functions ξj (contin-
uous line), and ψj (dotted line) for the case −1 q p 1.
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