222 5 Modelltheorie
gdw
D, I', b' = [θ', ξ, r—Aπ]
gdw
D, I', b' = [θ', ξ, Δ].
Zweitens: Sei Δ = rA ∧ Bπ. Also FGRAD(A) < FGRAD(Δ) und FGRAD(B) <
FGRAD(Δ). Dann ist nach Annahme fur Δ auch FV(A) ∪ FV(B) ⊆ {ξ}, I((TA(A) ∪
TA(B)) = I'((TA(A) ∪ TA(B)) und b((TT(A) ∪ TT(B)) = b'((TT(A) ∪ TT(B)). Mit I.V.
und Theorem 5-4-(iii) gilt dann:
D, I, b = [θ, ξ, Δ]
gdw
D, I, b = [θ, ξ, γa ∧ Bη
D, I, b = r[θ, ξ, A] ∧ [θ, ξ, BΓ
D, I, b = [θ, ξ, A] und D, I, b = [θ, ξ, B]
gdw
D, I', b' = [θ`, ξ, A] und D, I', b' = [θ', ξ, B]
D, I', b' = r[θ', ξ, A] ∧ [θ', ξ, BΓ
gdw
D, I,, b' = [θ', ξ, γa ∧ Bη
gdw
D, I', b' = [θ', ξ, Δ].
Der dritte bis funfte Fall verlaufen analog.
Sechstens: Sei Δ = rΛζA^l. Nach der Annahme fur Δ ist dann FV(A) ⊆ {ξ, ζ}, I (TA(A)
= I l(TA(A) und b (TT(A) = b l(TT(A). Angenommen ζ = ξ. Dann ist [θ, ξ, Δ] = [θ, ζ,
rΛζA^l ] = rΛζA^l = [θ', ζ, rΛζA^l ] = [θ', ξ, Δ] und somit [θ, ξ, Δ] = Δ = [θ', ξ, Δ]. Sodann
gilt FV(Δ) = 0 und somit Δ ∈ GFORM. Da nach Annahme I(TA(Δ) = Il(TA(Δ) und
b (TT(Δ) = b l(TT(Δ) gilt damit mit Theorem 5-5-(ii): D, I, b = [θ, ξ, Δ] gdw D, I, b = Δ
gdw D, I,, b' = Δ gdw D, I,, b' = [θ', ξ, Δ]. Sei nun ζ ≠ ξ. Dann ist [θ, ξ, Δ] = rΛζ[θ, ξ,
A]π und [θ', ξ, Δ] = rΛζ[θ,, ξ, A]π. Sodann gilt mit ζ ≠ ξ und ζ, ξ ∉ TT(θ*) fur alle θ# ∈
GTERM nach Theorem 1-25-(ii) fur alle β+ ∈ PAR: [β+, ζ, [θ, ξ, A]] = [θ, ξ, [β+, ζ, A]]
und [β+, ζ, [θ', ξ, A]] = [θ', ξ, [β+, ζ, A]].
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