Definition df-r 11139

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 11128	. 2 class ℝ
2		cnr 10879	. . 3 class R
3		c0r 10880	. . . 4 class 0R
4	3	csn 4601	. . 3 class {0R}
5	2, 4	cxp 5652	. 2 class (R × {0R})
6	1, 5	wceq 1540	1 wff ℝ = (R × {0R})

This definition is referenced by:  opelreal  11144  elreal  11145  elreal2  11146  axresscn  11162  ax1rid  11175  avril1  30444