Description: The half of an even positive integer is a positive integer. (Contributed by AV, 28-Jun-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | nnehalf | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnnn0 | |
|
2 | nn0ehalf | |
|
3 | 1 2 | sylan | |
4 | nn0enne | |
|
5 | 4 | adantr | |
6 | 3 5 | mpbid | |