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| Mirrors > Home > ILE Home > Th. List > com12 | Unicode version | ||
| Description: Inference that swaps (commutes) antecedents in an implication. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 4-Aug-2012.) |
| Ref | Expression |
|---|---|
| com12.1 |
|
| Ref | Expression |
|---|---|
| com12 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 19 |
. 2
| |
| 2 | com12.1 |
. 2
| |
| 3 | 1, 2 | syl5com 29 |
1
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