At: assignment monotone 1 1 1 2
1. f: Formula
2. x: Var
3. a: Assignment
4. a': Assignment
5. a' extends a
6. a |
x
a' |
x
By: Inst
Thm*
a,a':Assignment. a' extends a 
(
x:Var.
a(x) = 3

a(x) = a'(x))
[a;a';x]
Generated subgoals:| 1 | a(x) = 3 |
| 2 | 7. a(x) = a'(x) a' | x |
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