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Definition df-r 9984
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
StepHypRef Expression
1 cr 9973 . 2 class
2 cnr 9725 . . 3 class R
3 c0r 9726 . . . 4 class 0R
43csn 4210 . . 3 class {0R}
52, 4cxp 5141 . 2 class (R × {0R})
61, 5wceq 1523 1 wff ℝ = (R × {0R})
Colors of variables: wff setvar class
This definition is referenced by:  opelreal  9989  elreal  9990  elreal2  9991  axresscn  10007  ax1rid  10020  avril1  27449
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