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Mirrors > Home > NFE 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 |
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Ref | Expression |
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com12 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 |
. 2
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2 | com12.1 |
. 2
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3 | 1, 2 | syl5com 26 |
1
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