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| Mirrors > Home > MPE Home > Th. List > df-3an | Structured version Visualization version Unicode version | ||
| Description: Define conjunction ('and') of three wff's. Definition *4.34 of [WhiteheadRussell] p. 118. This abbreviation reduces the number of parentheses and emphasizes that the order of bracketing is not important by virtue of the associative law anass 681. (Contributed by NM, 8-Apr-1994.) |
| Ref | Expression |
|---|---|
| df-3an |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wph |
. . 3
| |
| 2 | wps |
. . 3
| |
| 3 | wch |
. . 3
| |
| 4 | 1, 2, 3 | w3a 1037 |
. 2
|
| 5 | 1, 2 | wa 384 |
. . 3
|
| 6 | 5, 3 | wa 384 |
. 2
|
| 7 | 4, 6 | wb 196 |
1
|
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