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| Description: Lemma for unified implication study. |
| Ref | Expression |
|---|---|
| u4lem1n |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | oran1 83 |
. . . . 5
| |
| 2 | df-a 39 |
. . . . . . . . . . 11
| |
| 3 | anor1 80 |
. . . . . . . . . . 11
| |
| 4 | 2, 3 | 2or 67 |
. . . . . . . . . 10
|
| 5 | 4 | ax-r4 36 |
. . . . . . . . 9
|
| 6 | df-a 39 |
. . . . . . . . . 10
| |
| 7 | 6 | ax-r1 34 |
. . . . . . . . 9
|
| 8 | 5, 7 | ax-r2 35 |
. . . . . . . 8
|
| 9 | ancom 68 |
. . . . . . . 8
| |
| 10 | 8, 9 | ax-r2 35 |
. . . . . . 7
|
| 11 | 10 | ran 71 |
. . . . . 6
|
| 12 | 11 | ax-r4 36 |
. . . . 5
|
| 13 | 1, 12 | ax-r2 35 |
. . . 4
|
| 14 | ancom 68 |
. . . . 5
| |
| 15 | df-a 39 |
. . . . . 6
| |
| 16 | anor2 81 |
. . . . . . . . 9
| |
| 17 | anor3 82 |
. . . . . . . . 9
| |
| 18 | 16, 17 | 2or 67 |
. . . . . . . 8
|
| 19 | 18 | ax-r4 36 |
. . . . . . 7
|
| 20 | 19 | ax-r1 34 |
. . . . . 6
|
| 21 | 15, 20 | ax-r2 35 |
. . . . 5
|
| 22 | 14, 21 | ax-r2 35 |
. . . 4
|
| 23 | 13, 22 | 2an 72 |
. . 3
|
| 24 | 23 | ax-r4 36 |
. 2
|
| 25 | u4lem1 719 |
. . 3
| |
| 26 | 25 | ax-r4 36 |
. 2
|
| 27 | oran 79 |
. 2
| |
| 28 | 24, 26, 27 | 3tr1 60 |
1
|
| Colors of variables: term |
| Syntax hints: |
| This theorem is referenced by: u4lem2 729 |
| This theorem was proved from axioms: ax-a1 29 ax-a2 30 ax-a3 31 ax-a4 32 ax-a5 33 ax-r1 34 ax-r2 35 ax-r4 36 ax-r5 37 ax-r3 421 |
| This theorem depends on definitions: df-b 38 df-a 39 df-t 40 df-f 41 df-i4 46 df-le1 122 df-le2 123 df-c1 124 df-c2 125 |