Description: 3 is an odd number. (Contributed by AV, 20-Jul-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | 3odd | |- 3 e. Odd |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2evenALTV | |- 2 e. Even |
|
2 | df-3 | |- 3 = ( 2 + 1 ) |
|
3 | evenp1odd | |- ( 2 e. Even -> ( 2 + 1 ) e. Odd ) |
|
4 | 2 3 | eqeltrid | |- ( 2 e. Even -> 3 e. Odd ) |
5 | 1 4 | ax-mp | |- 3 e. Odd |