Description: A join's second argument is less than or equal to the join. ( chub2 analog.) (Contributed by NM, 17-Sep-2011)
Ref | Expression | ||
---|---|---|---|
Hypotheses | latlej.b | |
|
latlej.l | |
||
latlej.j | |
||
Assertion | latlej2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | latlej.b | |
|
2 | latlej.l | |
|
3 | latlej.j | |
|
4 | simp1 | |
|
5 | simp2 | |
|
6 | simp3 | |
|
7 | eqid | |
|
8 | 1 3 7 4 5 6 | latcl2 | |
9 | 8 | simpld | |
10 | 1 2 3 4 5 6 9 | lejoin2 | |