Description: Bound-variable hypothesis builder for class abstraction. (Contributed by NM, 1-Sep-1999) Remove disjoint variable conditions. (Revised by Andrew Salmon, 11-Jul-2011) (Revised by Scott Fenton, 26-Oct-2024)
Ref | Expression | ||
---|---|---|---|
Hypothesis | nfopab.1 | |
|
Assertion | nfopab | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfopab.1 | |
|
2 | nftru | |
|
3 | nftru | |
|
4 | 1 | a1i | |
5 | 2 3 4 | nfopabd | |
6 | 5 | mptru | |