Элементы теории алгоритмов - 139 стр.

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§1
u
v
Trm(u)&WVbl(v)&Trm(ex(1)) &
((z)
z<ex(1)
(ex(1)=2
z
&
(ex(1)=v & ex(0)=u) (ex(1) = v & ex(0)=ex(1)))
(α)
α<ex(1)
(β)
β<ex(1)
(δ)
δ<ex(1)
(WFL(δ)&Trm(α)&Trm(β)&
ex(1)=2
3
α δ β 2
5
&
(α
0
)
α
0
<ex(0)
(β
0
)
β
0
<ex(0)
(ex(0)=2
3
α
0
δ β
0
2
5
&
Subst
Trm
(2
α
0
· 3
α
,u,v)&Subst
Trm
(2
β
0
·3
β
,u,v)))).
Subst
Atmfl
(γ,u,v) ex(1)
ex(0)
u v
Trm(u)&WVbl(v)&Atmf l(ex(1)) &
(α)
α<ex(1)
(β)
β<ex(1)
(Trm(α)&Trm(β)&
ex(1)=2
3
α 2
29
β 2
5
&
(α
0
)
α
0
<ex(0)
(β
0
)
β
0
<ex(0)
(ex(0)=2
3
α
0
2
29
β
0
2
5
&
Subst
Trm
(2
α
0
·3
α
,u,v)&Subst
Trm
(2
β
0
·3
β
,u,v)))
Subst
(1)
Fml
(γ,u,v) ex(1) ex(0)
u
v
Fml(ex(1)) & (Atmfl(ex(1)) & Subst
Atmfl
(γ,u,v))
((α)
α<ex(1)
(α
0
)
α
0
<ex(0)
(Fml(α)&
ex(1)=2
3
2
9
α 2
5
& ex(0)=2
3
2
9
α
0
2
5
&
Subst
Fml
(2
α
0
· 3
α
,u,v))
((α)
α<ex(1)
(α
0
)
α
0
<ex(0)
(β)
β<ex(1)
(β
0
)
β
0
<ex(0)
(δ)
δ<ex(1)
((δ =2
11
δ =2
13
δ =2
15
)&(Fml(α)&Fml(β)&
ex(1)=2
3
α δ β 2
5
& ex(0)=2
3
α
0
δ β
0
2
5
&
Subst
Fml
(2
α
0
·3
α
,u,v)&Subst
Fml
(2
β
0
· 3
β
,u,v))
((α)
α<ex(1)
(α
0
)
α
0
<ex(0)
(β)
β<ex(1)
(β
0
)
β
0
<ex(0)
(δ)
δ<ex(1)
((δ =2
17
δ =2
19
)&(Fml(α)&WVbl(β)&
ex(1)=2
3
δ β 2
5
α & ex(0)=2
3
δ β α
0
2
5
&
((β = v & α
0
= α) (β = v & Subst
Fml
(2
α
0
· 3
α
,u,v)).
Subst
Fml
(x, y, u, v) x
y
u
v