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| Description: Re-derivation of ax-7 1003 from ax67 1061. Note that ax-6o 1019 and ax-7 1003 are not used by the re-derivation. |
| Ref | Expression |
|---|---|
| ax67to7 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax67to6 1062 |
. . 3
| |
| 2 | 1 | a3i 77 |
. 2
|
| 3 | ax67 1061 |
. . 3
| |
| 4 | 3 | 19.20i 1033 |
. 2
|
| 5 | 2, 4 | syl 10 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1003 ax-gen 1004 ax-4 1014 ax-5o 1016 ax-6o 1019 |