Description: An integer which is divisible by 4 is divisible by 2, that is, is even. (Contributed by AV, 4-Jul-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | 4dvdseven | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2z | |
|
2 | 1 | a1i | |
3 | 4z | |
|
4 | 3 | a1i | |
5 | dvdszrcl | |
|
6 | 5 | simprd | |
7 | 2 4 6 | 3jca | |
8 | z4even | |
|
9 | 8 | jctl | |
10 | dvdstr | |
|
11 | 7 9 10 | sylc | |