Definition df-r 8190

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 8179	. 2 class RR
2		cnr 7665	. . 3 class R.
3		c0r 7666	. . . 4 class 0R
4	3	csn 3709	. . 3 class { 0R }
5	2, 4	cxp 4772	. 2 class ( R. X. { 0R } )
6	1, 5	wceq 1402	1 wff RR = ( R. X. { 0R } )

This definition is used by:  opelreal  8195  elreal  8196  elreal2  8198  axresscn  8228  ax1rid  8245