Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 22 | . . 3 | |
2 | 1 | anassrs 680 | . 2 |
3 | id 22 | . . 3 | |
4 | 3 | anasss 679 | . 2 |
5 | 2, 4 | impbii 199 | 1 |
Copyright terms: Public domain | W3C validator |