This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.
Description: Swap 1st and 2nd members of lattice join. ( chj12 analog.) (Contributed by NM, 4-Jun-2012)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | latjass.b | ||
| latjass.j | |||
| Assertion | latj12 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | latjass.b | ||
| 2 | latjass.j | ||
| 3 | 1 2 | latjcom | |
| 4 | 3 | 3adant3r3 | |
| 5 | 4 | oveq1d | |
| 6 | 1 2 | latjass | |
| 7 | simpl | ||
| 8 | simpr2 | ||
| 9 | simpr1 | ||
| 10 | simpr3 | ||
| 11 | 1 2 | latjass | |
| 12 | 7 8 9 10 11 | syl13anc | |
| 13 | 5 6 12 | 3eqtr3d |