At:
discrete Formula
1
2
1
1
1.
Q: Formula
Prop
2.
x:{x:Formula| Q(x) }, y:Formula. Dec(x = y)
3.
x: Formula
4.
Q(x)
5.
y@0: Formula
6.
x1: Formula
Dec(

x = 

x1)
By:
Decide (x = x1)
Generated subgoals:
| 1 | 7. x = x1 Dec(  x =   x1) |
| 2 | 7. x = x1 Dec(  x =   x1) |
About: