Description: 2 does not divide 1. That means 1 is odd. (Contributed by David A. Wheeler, 8-Dec-2018) (Proof shortened by Steven Nguyen, 3-May-2023)
Ref | Expression | ||
---|---|---|---|
Assertion | n2dvds1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | halfnz | |
|
2 | 1z | |
|
3 | evend2 | |
|
4 | 2 3 | ax-mp | |
5 | 1 4 | mtbir | |