Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > impbii | Unicode version |
Description: Infer an equivalence from an implication and its converse. (Contributed by NM, 29-Dec-1992.) |
Ref | Expression |
---|---|
impbii.1 | |
impbii.2 |
Ref | Expression |
---|---|
impbii |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | impbii.1 | . 2 | |
2 | impbii.2 | . 2 | |
3 | bi3 187 | . 2 | |
4 | 1, 2, 3 | mp2 9 | 1 |
Copyright terms: Public domain | W3C validator |