Description: The value of the rising factorial when N = 0 . (Contributed by Scott Fenton, 5-Jan-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | risefac0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0nn0 | ||
2 | risefacval | ||
3 | 1 2 | mpan2 | |
4 | risefall0lem | ||
5 | 4 | prodeq1i | |
6 | prod0 | ||
7 | 5 6 | eqtri | |
8 | 3 7 | eqtrdi |