Center for
Mathematical Economics
Working Papers 552
February 2016
Convex vNM–Stable Sets for a
Semi Orthogonal Game
Part V:
All Games have vNM–Stable Sets Joachim Rosenm¨ uller
Center for Mathematical Economics (IMW) Bielefeld University
Universit¨ atsstraße 25 D-33615 Bielefeld · Germany e-mail:
ISSN: 0931-6558
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T ≤ := { ξ • ≤ η} •
$ %&T > ∈ F (t)
&# "(t) D τ
F (t)
T >
G & $$&
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>
a (t)
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A=>
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CA > =
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T 1 t a(t) η
CA > =
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CA
B
?B C@AA
>
ε
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<
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1 st STEP :
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v (t)
$ %# :a (t)
ε 0 > 0
&#ε < ε 0
&
T ε = T εa (t) ⊆ S
# !ξ dom v (t)
T ε a(t) η
$ D #&ε ≤ 1 t
(t) D
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$
2 nd STEP :
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#
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(t) a = (1, . . . , 1, . . . , 1, . . . , α r , β r )
α r = (t) a τ b r = (h τ 1 + . . . + h τ r−1 + h τ r ) − 1 h τ r − h τ r
, β r = (t) a τ r = 1 − (h τ 1 + . . . + h τ r )
h τ r − h τ r
;
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5
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(t) h τ
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α r + β r = 1
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τ = ( b τ 1 , . . . , b τ r , τ r )
9 !
(t) a
$ 4ρ ∈ R \ {r}
&+$-+
T 1 t a (t) ∩ C ρ = (t) D b τ ρ (ρ ∈ R \ {r}) .
8
T > ∈ F (t)
& # "C0(t) D τ
F (t)
T >
G
& $$&
+$--
(t) D τ ⊆ T >
(t) D τ ⊆ T ≤
4
"
T εa (t) ∩ C ρ ⊆ (t) D b τ ρ
λ( (t) D τ b ∩ {ξ > η}) > 0
$ %&! +$-- &
(t) D b τ ρ ⊆ {ξ > η}
$ D9#&+$-.
T 1 t a (t) ∩ C ρ = (t) D b τ ρ ⊆ {ξ > η}
3 rd STEP :
5&ρ = r
τ = τ b r , τ r
!
"
$
8! &
T εa (t) ∩ C r ⊆ (t) D b τ ρ ∪ (t) D τ r
λ ( (t) D τ ∩ {ξ > η}) > 0
"(t) D τ ⊆ {ξ > η} (τ = b τ r , τ r ).
;&
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T 1 t a (t)
$ ( & ? @> ?T 1 t α r
(t) D b τ
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?
@> ?
T 1 t β r
(t) D τ
"1 t β r
:
T 1 t a (t)
T 1 t a (t) ∩ C ρ := T 1 t α r ∪ T 1 t β r .
%
+$-/
(t) D τ ∩ T 1 t a (t) ⊆ (t) D τ ⊆ {ξ > η} (τ = b τ r , τ r ) , 4 th STEP :
&
λ(T 1 t a (t) ) = 1
t (α r + β r ) = 1
tε (α r + β r )λ(T εa (t) )
λ 0 (T 1 t a (t) ) = 1
t (α r + β r ) = 1 t
1 − X
ρ∈R\{r}
h (t) b τ
ρ
= 1
tε λ 0 (T εa (t) )
+$-E
→
λ(T 1 t a (t) ) = 1 tε
→ λ(T εa (t) ) , λ 0 (T 1 t a (t) ) = 1
tε λ 0 (T εa (t) )
?
?
+$-F
v(T 1 t a (t) ) = 1
tε v(T εa (t) ) = 1 t .
8
ξ
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$$& # " &
ξ(T 1 t a (t) ) = tε 1 ξ(T εa (t) )
$ ;&+$-
ξ(T 1 t a (t) ) = 1
tε ξ(T εa (t) ) ≤ 1
tε v (t) (T εa (t) ) = v (t) (T 1 t a (t) ).
-
#
+$-. +$-/ &
+$-
ξ > η
T 1 t a (t) .
D
"
! +$- +$- &
ξ dom 1
t T a(t) η,
"
7
2 nd ST EP
3 rd ST EP
+$-
T 1 t a (t) ∩ C r = T 1 t α r ∪ T 1 t β r ⊆ {ξ > η}
#
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α r
β r
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t ∈
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ξ (t) =
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ξ (t) dom v S (t) η
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F (t)
<?A= ?
B >
@A>A ?
>
a (t)
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?BC ?
?@>@B
T 1 t a (t)
A= >?>+$.
→
λ(T 1 t a (t) ) = 1 t a (t) ,
?BC
+$.+
ξ dom v
T 1 t a(t) η
CA > =
1 st STEP :
!
"
$ 4
"
v
v 0
$ 4C r ∩ T 1 t a (t) v
v 0
?
?
+$-E
3
!
!
"
$ 8
4 th ST EP
!T 1 t α r
T 1 t β r
#+$. -
ξ(T 1 t α r ) = ξ (t) (T 1 t α r )
ξ(T 1 t β r ) = ξ (t) (T 1 t β r )
:$ ;&
ξ (t)
#ξ
$ %& #0 ! 9 0
n
ξ > ξ (t) o
∩ (t) D b τ ρ
n
ξ < ξ (t) o
∩ (t) D b τ ρ
#
&
"
T 1 t α r
" #T 1 t β r
$2 nd STEP :
! !
"
0
"
"
"
"
!
5
(t)
# $
(&
1 t h (t) ( τ b
ρ )
#
λ 0
D b τ ρ
+$..
Z
• λ 0 >h (t) (b
τρ )
•
λ 0 − h (t) ( τ b
ρ ) =
Z
• λ 0 <h (t) (b
τρ )
h (t) ( b τ
ρ ) − λ • 0 .
&
ε > 0
F > ε ⊆ •
λ 0 > h (t) ( b τ
ρ )
, F = ε ⊆ •
λ 0 = h (t) ( b τ
ρ )
, F < ε ⊆ •
λ 0 < h (t) ( τ b
ρ )
+$./
λ (F > ε ∪ F = ε ∪ F < ε ) = ε
+$. E
Z
F > ε
•
λ 0 − h (t) ( b τ
ρ )
dλ =
Z
F < ε
h (t) ( τ b
ρ ) − λ • 0
dλ .
AG %
"
$ %
Z
F > ε
•
λ 0 dλ + Z
F = ε
•
λ 0 dλ + Z
F < ε
•
λ 0 dλ
= Z
F > ε ∪F = ε ∪F < ε
h (t) ( τ b
ρ ) dλ +
Z
F > ε
•
λ 0 − h (t) (b τ ρ )
d λ + Z
F = ε
•
λ 0 d λ − h (t) (b τ ρ )
d λ + Z
F < ε
•
λ 0 d λ − h (t) (b τ ρ )
d λ
= εh (t) ( b τ
ρ ) dλ + Z
F > ε
•
λ 0 − h (t) ( τ b
ρ )
dλ −
Z
F < ε
•
λ 0 dλ − h (t) ( b τ
ρ )
dλ
= εh (t) ( b τ
ρ ) dλ .
+$.F
?
?
9
!
"
+$. E $ %
&
ε = α t r
+$.
λ 0 (F > ε ∪ F = ε ∪ F < ε ) = Z
F > ε ∪F = ε ∪F < ε
•
λ 0 dλ = α r h (t) ( τ b
ρ )
t .
&
T 1 t α r := F > ε ∪ F = ε ∪ F < ε
&+$.
λ 0 (T 1 t α r ) = α r h (t) (b τ
ρ )
t = x (t) τ b
ρ h (t) (b τ
ρ )
t = λ (t) (T 1 t α r ) .
%
λ 0 ( D b τ ρ ∩T 1 t (t) a ) = λ ( D b τ r )h (t) ( b τ r ) = α r
t h (t) ( b τ r ) = 1 t x ¯ (t) b τ
r
(t) a τ b r = 1 t
(t) a b τ r h (t) ( τ b r )
¯ ξ (t) ( (t) D b τ r ∩ T 1 t (t) a ) = ¯ ξ (t) ( (t) D τ b r ∩ T 1 t α r )
= α r λ (t) (D τ b ρ ) = α r λ 0 ( (t) D τ b r )
= 1 t x ¯ (t) b τ
r
(t) a τ b r = 1 t
(t) a b τ r h (t) (b τ
r )
= α r
t h (t) ( b τ r )
+$.
$$&
¯ ξ(T 1 t α r ) = ¯ ξ (t) (T 1 t α r ) = α r
t h (t) ( b τ
r ) . 3 rd STEP :
4
T 1 t β r
!" " $4
#
τ r
(t) D τ r ⊆ E ∧
&¯ ξ • = 1 − l ? r = 1 − h (t)? r = x (t)
τ r
(t) D τ r .
%&
"
T 1 t β r
&¯ ξ(T 1 t β r ) = ¯ ξ (t) (T 1 t β r ) = β r
1 − l r ?
t = β r
1 − h (t)? r
t = β r
1 t x ¯ (t) τ
r .
&
5
#
2 nd ST EP
AT 1 t β r ⊆ (t) D τ r
AG3
%
"
λ 0 (T 1 t β r ) = β r λ 0 (D τ r )
$ % !
+$/
λ 0 (D τ r ∩ T 1 t (t) a ) = β r
t h (t) (τ
r ) = 1
t
(t) a τ
r h (t) (τ
r ) = 1
t x ¯ (t)
τ r
(t) a τ
r
?
?
%
#
+$. - $
S
"λ(S) = p t
$ %
""
(t) D
S ∈ F (t)
G# !S q
"
!
"
1 t
!
"
I \S
#$ %!!
#
%
"
"
5
$
>
ξ
?BCη
@<=>?>@BA ?BC
>
S
? ?@>@B A= >?>ξ dom v S η
AA=< >?>
λ(S) = p t
@A ?>@B?
T > := { ξ • > η} •
?A ?>@B? <?A=λ(T > ) = q t
@> >A?<
t
>
(t) D
? =B@
< <C
A=
>
?>
S ∈ F (t)
?BCT > ∈ F (t)
?BC >ξ (t) := P
ξ F (t) (•)
B > ?>@BA+$/+
ξ dom v S η, ξ dom v S (t) η,
?BCξ (t) dom v S (t) η
C > =
A@<=?>?B
=A
>
@A>A ?
>
a (t)
?B>v (t)
A= >?>T 1 t a (t) ⊆ S
?BC+$/-
ξ dom v
T 1 t a(t) η , ξ dom v (t)
T 1 t a(t) η , ξ (t) dom v (t)
T 1 t a(t) η .
%:
"
"
A
""
+$+
"
%
"
+$-&
#
5
"
"
$
(
! A
""
"
v
$
>
ξ
?BCη
@<=>?>@BA
S
? ?@>@B ?BC >ξ dom S η
B>
@A>A ?
?@>@B
T ⊆ S
A= >?>λ(T ρ ) = λ(T ∩C ρ )
@A ?>@B?
ρ ∈ R
?BCξ dom T η .
1 st STEP :
4 "ξ(S) < v(S)
$ 4ρ ∈ R
9
"
r n ρ
r ρ n ↑ n λ (S ρ ) (n → ∞)
#
AG%
"
!9
S n ρ ⊆ S n+1 ρ ⊆ S ρ
λ(S n ρ ) = r n ρ
S n ρ ↑ S ρ (n ∈
)
&S n ↑ S (n ∈
)
$ %ξ(S n ) ↑ ξ(S)
λ ρ (S n ) ↑ λ ρ (S)
ρ ∈ R 0 (n ∈
),
?
?
v(S n ) ↑ v(S) (n ∈
)
$ D9#& # !n ∈
ξ(S n ) < v(S n )
&S n ⊆ S
&ξ > η
S n
$ % &
ξ dom S n η
#
!
n ∈
$2 nd STEP :
+$/.
ξ(S) = v(S) .
s ρ := λ(S ρ )(ρ ∈ R)
$ (&"T ⊆ S
ξ(T ) < v(T )
&
"
#
:
$
%&
+$// 4
T ⊆ S
λ(T ) < λ(S),
ξ(T ) = v(T ).
%
0 ≤ t ≤ 1
S t,ρ ⊆ S ρ
λ(S t,ρ ) = ts ρ
$ %&
r ρ
t := r s ρ
ρ < 1
ρ ∈ R
&λ(S t,ρ ) = ts ρ = r ρ s ρ
s ρ
= r ρ ;
#
λ(S t ) = v(S t )
# +$// $ 8S t ⊆ S
0ξ > η
S t
&ξ dom S t η
$3 rd STEP :
%&
"
ξ(S) = v(S)
T ⊆ S
λ(T ) < λ(S)
&ξ(T ) > v(T )
$A
+$/E
R ? := {ρ ∈ R ξ(S) = λ ρ (S)} = {ρ ∈ R λ ρ (S) = v(S)} 6= ∅
+$/F
ξ (S) < λ ρ (S) (ρ ∈ R \ R ? ) .
5
:
R • := {ρ ∈ R
5ε 0 > 0
0 < ε < ε 0
T ⊆ S
λ(S) − ε < λ(T ) < λ(S) ξ(T ) > λ ρ (T ) } 6= ∅ .
+$/
D
#
+$/
R • ⊆ R ? .
?
?
ε •
G
#
ρ ∈ R •
& $$& #
0 < ε < ε •
T ⊆ S
λ(S) − ε < λ(T ) < λ(S), ξ (T ) > λ ρ (T ) (ρ ∈ R • )
ξ (T ) = λ ρ (T ) (ρ ∈ R ? \ R • )
+$/
D
"
µ := (ξ, λ, λ 0 , . . . , λ r )
$ 4 "ε < ε •
T ⊆ S
# !λ (S) − ε < λ (T ) < λ (S)
ξ(S \ T ) = ξ(S) − ξ(T ) = λ ρ (S) − ξ(T )
< λ ρ (S) − λ ρ (T ) = λ ρ (S \ T ) (ρ ∈ R • )
+$E
ξ(S \ T ) = ξ(S) − ξ(T ) = λ ρ (S) − ξ(T )
= λ ρ (S) − λ ρ (T ) = λ ρ (S \ T ) (ρ ∈ R ? \ R • ) .
+$E+
5
& +$/F &
ε •
#
"
0
T ⊆ S
λ(S) − ε < λ(T ) < λ(S)
&+$E-
ξ(T ) < λ ρ (T ) (ρ ∈ R \ R ? ) .
"
q, {q ρ } ρ∈R
+$E.
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