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| Mirrors > Home > QLE Home > Th. List > lan | Unicode version | ||
| Description: Introduce conjunct on left. |
| Ref | Expression |
|---|---|
| lan.1 |
|
| Ref | Expression |
|---|---|
| lan |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | lan.1 |
. . . . 5
| |
| 2 | 1 | ax-r4 37 |
. . . 4
|
| 3 | 2 | lor 70 |
. . 3
|
| 4 | 3 | ax-r4 37 |
. 2
|
| 5 | df-a 40 |
. 2
| |
| 6 | df-a 40 |
. 2
| |
| 7 | 4, 5, 6 | 3tr1 63 |
1
|
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