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Mirrors > Home > QLE Home > Th. List > lebi | Unicode version |
Description: L.e. to biconditional. |
Ref | Expression |
---|---|
lebi.1 | |
lebi.2 |
Ref | Expression |
---|---|
lebi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lebi.2 | . . . . 5 | |
2 | 1 | df-le2 131 | . . . 4 |
3 | 2 | ax-r1 35 | . . 3 |
4 | ax-a2 31 | . . 3 | |
5 | 3, 4 | ax-r2 36 | . 2 |
6 | lebi.1 | . . 3 | |
7 | 6 | df-le2 131 | . 2 |
8 | 5, 7 | ax-r2 36 | 1 |
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