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| Mirrors > Home > ILE Home > Th. List > biimprd | Unicode version | ||
| Description: Deduce a converse implication from a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 22-Sep-2013.) |
| Ref | Expression |
|---|---|
| biimprd.1 |
|
| Ref | Expression |
|---|---|
| biimprd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 |
. 2
| |
| 2 | biimprd.1 |
. 2
| |
| 3 | 1, 2 | imbitrrid 156 |
1
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