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| 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 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pm3.22 465 |
. 2
| |
| 2 | pm3.22 465 |
. 2
| |
| 3 | 1, 2 | impbii 199 |
1
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