Description: Lemma used to prove wl-sbcom2d . (Contributed by Wolf Lammen, 10-Aug-2019) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | wl-sbcom2d-lem1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfna1 | |
|
2 | nfeqf2 | |
|
3 | 1 2 | nfan1 | |
4 | sbequ | |
|
5 | 4 | adantl | |
6 | 3 5 | sbbid | |
7 | 6 | ancoms | |
8 | sbequ | |
|
9 | 7 8 | sylan9bbr | |
10 | 9 | expr | |