Description: The length of a closed walk of a fixed length as word is a positive integer. (Contributed by AV, 22-Mar-2022)
Ref | Expression | ||
---|---|---|---|
Assertion | clwwlknnn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0i | ||
2 | df-nel | ||
3 | 2 | biimpri | |
4 | 3 | olcd | |
5 | clwwlkneq0 | ||
6 | 4 5 | syl | |
7 | 1 6 | nsyl2 |