Database
REAL AND COMPLEX NUMBERS
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Positive reals (as a subset of complex numbers)
rpcn
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nnrp
Metamath Proof Explorer
Ascii
Structured
Theorem
rpcn
Description:
A positive real is a complex number.
(Contributed by
NM
, 11-Nov-2008)
Ref
Expression
Assertion
rpcn
⊢
(
𝐴
∈ ℝ
+
→
𝐴
∈ ℂ )
Proof
Step
Hyp
Ref
Expression
1
rpre
⊢
(
𝐴
∈ ℝ
+
→
𝐴
∈ ℝ )
2
1
recnd
⊢
(
𝐴
∈ ℝ
+
→
𝐴
∈ ℂ )