Description: Obsolete version of nelb as of 3-Nov-2024. (Contributed by Thierry Arnoux, 20-Nov-2023) (Proof shortened by SN, 23-Jan-2024) (Proof modification is discouraged.) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | nelbOLD |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ne | ||
2 | 1 | ralbii | |
3 | ralnex | ||
4 | 2 3 | bitri | |
5 | risset | ||
6 | 4 5 | xchbinxr | |
7 | 6 | bicomi |