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Description: Swap 2nd and 3rd members of lattice join. Lemma 2.2 in MegPav2002 p. 362. (Contributed by NM, 2-Dec-2011)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | latjass.b | ||
| latjass.j | |||
| Assertion | latj32 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | latjass.b | ||
| 2 | latjass.j | ||
| 3 | 1 2 | latjcom | |
| 4 | 3 | 3adant3r1 | |
| 5 | 4 | oveq2d | |
| 6 | 1 2 | latjass | |
| 7 | simpr1 | ||
| 8 | simpr3 | ||
| 9 | simpr2 | ||
| 10 | 7 8 9 | 3jca | |
| 11 | 1 2 | latjass | |
| 12 | 10 11 | syldan | |
| 13 | 5 6 12 | 3eqtr4d |