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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 26 | 1 |
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