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 : ℂ ⟶ ℝ | |
2 | ffun | ⊢ ( abs : ℂ ⟶ ℝ → Fun abs ) | |
3 | 1 2 | ax-mp | ⊢ Fun abs |