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Mirrors > Home > MPE Home > Th. List > anass | Structured version Visualization version Unicode version |
Description: Associative law for conjunction. Theorem *4.32 of [WhiteheadRussell] p. 118. (Contributed by NM, 21-Jun-1993.) (Proof shortened by Wolf Lammen, 24-Nov-2012.) |
Ref | Expression |
---|---|
anass |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 22 |
. . 3
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2 | 1 | anassrs 658 |
. 2
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3 | id 22 |
. . 3
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4 | 3 | anasss 657 |
. 2
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5 | 2, 4 | impbii 192 |
1
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