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Mirrors > Home > MPE Home > Th. List > biimprcd | Structured version Visualization version Unicode version |
Description: Deduce a converse commuted implication from a logical equivalence. (Contributed by NM, 3-May-1994.) (Proof shortened by Wolf Lammen, 20-Dec-2013.) |
Ref | Expression |
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biimpcd.1 |
Ref | Expression |
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biimprcd |
Step | Hyp | Ref | Expression |
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1 | id 22 | . 2 | |
2 | biimpcd.1 | . 2 | |
3 | 1, 2 | syl5ibrcom 237 | 1 |
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