Description: All variables are effectively bound in an identical variable specifier. Usage of this theorem is discouraged because it depends on ax-13 . (Contributed by Mario Carneiro, 11-Aug-2016) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | nfae | |- F/ z A. x x = y |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hbae | |- ( A. x x = y -> A. z A. x x = y ) |
|
2 | 1 | nf5i | |- F/ z A. x x = y |