Definition df-bj-rrbar 33116

Description: Definition of the set of extended real numbers RRbar. See df-xr 10078. (Contributed by BJ, 29-Jun-2019.)

Assertion

Ref	Expression
df-bj-rrbar	|- RRbar = ( RR u. {minfty , pinfty } )

Detailed syntax breakdown of Definition df-bj-rrbar

Step	Hyp	Ref	Expression
1		crrbar 33115	. 2 class RRbar
2		cr 9935	. . 3 class RR
3		cminfty 33110	. . . 4 class minfty
4		cpinfty 33106	. . . 4 class pinfty
5	3, 4	cpr 4179	. . 3 class {minfty , pinfty }
6	2, 5	cun 3572	. 2 class ( RR u. {minfty , pinfty } )
7	1, 6	wceq 1483	1 wff RRbar = ( RR u. {minfty , pinfty } )

This definition is referenced by: (None)