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Related theorems Unicode version |
| Description: Disjunction with 0. |
| Ref | Expression |
|---|---|
| or0 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dff2 92 |
. . . 4
| |
| 2 | ax-a2 30 |
. . . . 5
| |
| 3 | 2 | ax-r4 36 |
. . . 4
|
| 4 | 1, 3 | ax-r2 35 |
. . 3
|
| 5 | 4 | lor 66 |
. 2
|
| 6 | ax-a5 33 |
. 2
| |
| 7 | 5, 6 | ax-r2 35 |
1
|