| 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 |