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REAL AND COMPLEX NUMBERS
Elementary real and complex functions
Square root; absolute value
absge0d
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absval2d
Metamath Proof Explorer
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Theorem
absge0d
Description:
Absolute value is nonnegative.
(Contributed by
Mario Carneiro
, 29-May-2016)
Ref
Expression
Hypothesis
abscld.1
⊢
φ
→
A
∈
ℂ
Assertion
absge0d
⊢
φ
→
0
≤
A
Proof
Step
Hyp
Ref
Expression
1
abscld.1
⊢
φ
→
A
∈
ℂ
2
absge0
⊢
A
∈
ℂ
→
0
≤
A
3
1
2
syl
⊢
φ
→
0
≤
A