Definition df-r 8153

Description: Define the set of real numbers. (Contributed by NM, 22-Feb-1996.)

Assertion

Ref	Expression
df-r	|- RR = ( R. X. { 0R } )

Detailed syntax breakdown of Definition df-r

Step	Hyp	Ref	Expression
1		cr 8142	. 2 class RR
2		cnr 7628	. . 3 class R.
3		c0r 7629	. . . 4 class 0R
4	3	csn 3694	. . 3 class { 0R }
5	2, 4	cxp 4752	. 2 class ( R. X. { 0R } )
6	1, 5	wceq 1398	1 wff RR = ( R. X. { 0R } )

This definition is referenced by:  opelreal  8158  elreal  8159  elreal2  8161  axresscn  8191  ax1rid  8208