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π −
π
Δ
−+=+
+ −− = −
[ ]−++=
ϕω +=
[ ] ϕ ω ωω ϕ= + = =
=ϕ= = −
= ϕ =
=∂
∂−Δ με =
∂
∂−Δ με
−= ω −= ω
+= +=
ω
=
ε
ω= −
ω= +
σ
ε ω
= ∧
= =
( )θ
θ
( )ω= ω
( )ω ϕ= +
θ θ=
∈∈
μ
π=
IM
PR
ER
IE
NA
TI
ON
AL
E –
14
1325
– D
’ap
rès
do
cum
ents
fo
urn
is
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