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Mirrors > Home > MPE Home > Th. List > ancom | Structured version Visualization version Unicode version |
Description: Commutative law for conjunction. Theorem *4.3 of [WhiteheadRussell] p. 118. (Contributed by NM, 25-Jun-1998.) (Proof shortened by Wolf Lammen, 4-Nov-2012.) |
Ref | Expression |
---|---|
ancom |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm3.22 456 |
. 2
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2 | pm3.22 456 |
. 2
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3 | 1, 2 | impbii 192 |
1
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