Description: Lemma for 4at . (Contributed by NM, 10-Jul-2012)
Ref | Expression | ||
---|---|---|---|
Hypotheses | 4at.l | |
|
4at.j | |
||
4at.a | |
||
Assertion | 4atlem0be | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 4at.l | |
|
2 | 4at.j | |
|
3 | 4at.a | |
|
4 | simp1 | |
|
5 | simp23 | |
|
6 | simp21 | |
|
7 | simp22 | |
|
8 | simp3 | |
|
9 | 1 2 3 | atnlej1 | |
10 | 9 | necomd | |
11 | 4 5 6 7 8 10 | syl131anc | |