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SUPPLEMENTARY MATERIAL (USERS' MATHBOXES)
Mathbox for BJ
Extended real and complex numbers, real and complex projective lines
Extended numbers and projective lines as sets
cccinfty
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df-bj-ccinfty
Metamath Proof Explorer
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Unicode
Syntax definition
cccinfty
Description:
Syntax for the circle at infinity
CCinfty
.
Ref
Expression
Assertion
cccinfty
class
ℂ
∞