Description: The absolute value is a function. (Contributed by Glauco Siliprandi, 11-Oct-2020)
Ref | Expression | ||
---|---|---|---|
Assertion | absfun | |- Fun abs |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | absf | |- abs : CC --> RR |
|
2 | ffun | |- ( abs : CC --> RR -> Fun abs ) |
|
3 | 1 2 | ax-mp | |- Fun abs |