Metamath Proof Explorer


Definition df-bj-rrhat

Description: Define the real projective line. (Contributed by BJ, 27-Jun-2019)

Ref Expression
Assertion df-bj-rrhat ^ =

Detailed syntax breakdown

Step Hyp Ref Expression
0 crrhat class ^
1 cr class
2 cinfty class
3 2 csn class
4 1 3 cun class
5 0 4 wceq wff ^ =