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Definition df-abs 9571
Description: Define the function for the absolute value (modulus) of a complex number. (Contributed by NM, 27-Jul-1999.)
Assertion
Ref Expression
df-abs abs = (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥))))

Detailed syntax breakdown of Definition df-abs
StepHypRef Expression
1 cabs 9569 . 2 class abs
2 vx . . 3 setvar 𝑥
3 cc 6885 . . 3 class
42cv 1242 . . . . 5 class 𝑥
5 ccj 9413 . . . . . 6 class
64, 5cfv 4902 . . . . 5 class (∗‘𝑥)
7 cmul 6892 . . . . 5 class ·
84, 6, 7co 5512 . . . 4 class (𝑥 · (∗‘𝑥))
9 csqrt 9568 . . . 4 class
108, 9cfv 4902 . . 3 class (√‘(𝑥 · (∗‘𝑥)))
112, 3, 10cmpt 3818 . 2 class (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥))))
121, 11wceq 1243 1 wff abs = (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥))))
Colors of variables: wff set class
This definition is referenced by:  absval  9573  absf  9680
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