Description: Alternate definition for odd numbers. (Contributed by AV, 18-Jun-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | dfodd3 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfodd6 | |
|
2 | eqcom | |
|
3 | 2 | a1i | |
4 | 3 | rexbidva | |
5 | odd2np1 | |
|
6 | 4 5 | bitr4d | |
7 | 6 | rabbiia | |
8 | 1 7 | eqtri | |