Definition df-r 11098

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

Assertion

Ref	Expression
df-r	⊢ ℝ = (R × {0R})

Detailed syntax breakdown of Definition df-r

Step	Hyp	Ref	Expression
1		cr 11087	. 2 class ℝ
2		cnr 10838	. . 3 class R
3		c0r 10839	. . . 4 class 0R
4	3	csn 4585	. . 3 class {0R}
5	2, 4	cxp 5650	. 2 class (R × {0R})
6	1, 5	wceq 1563	1 wff ℝ = (R × {0R})

This definition is referenced by:  opelreal  11103  elreal  11104  elreal2  11105  axresscn  11121  ax1rid  11134  avril1  30723