---

Step * 1 1 1 of Lemma FormSafe1'-iff-FormSafe1''


1. C : Type
2. left : Form(C)
3. right : Form(C)
4. ∀vs:Atom List. (FormSafe1'(left) vs ⇐⇒ FormSafe1''(left) vs)
5. ∀vs:Atom List. (FormSafe1'(right) vs ⇐⇒ FormSafe1''(right) vs)
6. vs : Atom List
7. theta : Atom List
8. l_subset(Atom;theta;vs-FormFvs(right))
9. FormSafe1(left) theta
10. FormSafe1(right) vs-theta
⊢ set-equal(Atom;vs-FormFvs(right);theta)
BY
{ (FLemma `FormSafe1-Fvs-subset` [-1] THENA Auto) }

1
1. C : Type
2. left : Form(C)
3. right : Form(C)
4. ∀vs:Atom List. (FormSafe1'(left) vs ⇐⇒ FormSafe1''(left) vs)
5. ∀vs:Atom List. (FormSafe1'(right) vs ⇐⇒ FormSafe1''(right) vs)
6. vs : Atom List
7. theta : Atom List
8. l_subset(Atom;theta;vs-FormFvs(right))
9. FormSafe1(left) theta
10. FormSafe1(right) vs-theta
11. l_subset(Atom;vs-theta;FormFvs(right))
⊢ set-equal(Atom;vs-FormFvs(right);theta)

---

Latex:

---

Latex:

1.  C  :  Type
2.  left  :  Form(C)
3.  right  :  Form(C)
4.  \mforall{}vs:Atom  List.  (FormSafe1'(left)  vs  \mLeftarrow{}{}\mRightarrow{}  FormSafe1''(left)  vs)
5.  \mforall{}vs:Atom  List.  (FormSafe1'(right)  vs  \mLeftarrow{}{}\mRightarrow{}  FormSafe1''(right)  vs)
6.  vs  :  Atom  List
7.  theta  :  Atom  List
8.  l\_subset(Atom;theta;vs-FormFvs(right))
9.  FormSafe1(left)  theta
10.  FormSafe1(right)  vs-theta
\mvdash{}  set-equal(Atom;vs-FormFvs(right);theta)


By

---

Latex:
(FLemma  `FormSafe1-Fvs-subset`  [-1]  THENA  Auto)

---

Home Index