Database
SUPPLEMENTARY MATERIAL (USERS' MATHBOXES)
Mathbox for BJ
Extended real and complex numbers, real and complex projective lines
Extended numbers and projective lines as sets
cccinftyN
Next ⟩
df-bj-ccinftyN
Metamath Proof Explorer
Ascii
Unicode
Syntax definition
cccinftyN
Description:
Syntax for the circle at infinity
CCinftyN
.
Ref
Expression
Assertion
cccinftyN
class
ℂ
∞N