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Definition df-abs 14020
Description: Define the function for the absolute value (modulus) of a complex number. See abscli 14178 for its closure and absval 14022 or absval2i 14180 for its value. For example, (abs‘-2) = 2 (ex-abs 27442). (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 14018 . 2 class abs
2 vx . . 3 setvar 𝑥
3 cc 9972 . . 3 class
42cv 1522 . . . . 5 class 𝑥
5 ccj 13880 . . . . . 6 class
64, 5cfv 5926 . . . . 5 class (∗‘𝑥)
7 cmul 9979 . . . . 5 class ·
84, 6, 7co 6690 . . . 4 class (𝑥 · (∗‘𝑥))
9 csqrt 14017 . . . 4 class
108, 9cfv 5926 . . 3 class (√‘(𝑥 · (∗‘𝑥)))
112, 3, 10cmpt 4762 . 2 class (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥))))
121, 11wceq 1523 1 wff abs = (𝑥 ∈ ℂ ↦ (√‘(𝑥 · (∗‘𝑥))))
Colors of variables: wff setvar class
This definition is referenced by:  absval  14022  absf  14121  absfico  39724
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