Description: An integer is odd iff its predecessor divided by 2 is an integer. This is another representation of odd numbers without using the divides relation. (Contributed by AV, 18-Jun-2021) (Proof shortened by AV, 22-Jun-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | oddm1d2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oddp1d2 | |
|
2 | zob | |
|
3 | 1 2 | bitrd | |