+ + − + + = δ + δ
=−=
( )= − ( )( )= − −
= =
= =
=
( ) ( )( )− + − + − −=
−
=
= =
λ
Φ
Φ
π π π
( )λ Φ
Φ
−
λ
Σ
( )Φ = − Σ
λ
λ
Φ
− −
Φ −
( )= + +
π λ
λ
( ) =
( ) =
( ) = ( ) =
( )−
( )−
Φ
( )Φ = −
= =
+
+λ
λ
ρ
η
Δ = − >
( )Δ= −
η
Δ =
= =−=
−= = =
=− −=
=
( )
⎯⎯→←⎯⎯( )
=−
Λ= − Λ
Δ
Δ
Δ
Δ
( )−
= + = + α
+
( ) α
( )Δ = −
=
= = −= =
Δ
ε=
( )=
Δ = −
( )Δ = α −− Δ = α
= = − −ε = − −α =
Δ
−Δ =
≈
ϕ
ϕ
ρ
ρ
•• −=
•• − −=
•• −η =
•• −=
=
( )− ( )−
=
( )− ( )−
( )−
IM
PR
IM
ER
IE
NA
TI
ON
AL
E –
14
1320
– D
’ap
rès
do
cum
ents
fo
urn
is
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