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REAL AND COMPLEX NUMBERS
Integer sets
Some properties of specific numbers
halfcn
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halfgt0
Metamath Proof Explorer
Ascii
Structured
Theorem
halfcn
Description:
One-half is a complex number.
(Contributed by
David A. Wheeler
, 8-Dec-2018)
Ref
Expression
Assertion
halfcn
⊢
( 1 / 2 ) ∈ ℂ
Proof
Step
Hyp
Ref
Expression
1
2cn
⊢
2 ∈ ℂ
2
2ne0
⊢
2 ≠ 0
3
1
2
reccli
⊢
( 1 / 2 ) ∈ ℂ