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| Description: Deduction from Theorem 19.23 of [Margaris] p. 90. |
| Ref | Expression |
|---|---|
| 19.23adv.1 |
|
| Ref | Expression |
|---|---|
| 19.23adv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-17 1317 |
. 2
| |
| 2 | ax-17 1317 |
. 2
| |
| 3 | 19.23adv.1 |
. 2
| |
| 4 | 1, 2, 3 | 19.23ad 1415 |
1
|