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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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