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Definition df-r 9803
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 9792 . 2 class
2 cnr 9544 . . 3 class R
3 c0r 9545 . . . 4 class 0R
43csn 4124 . . 3 class {0R}
52, 4cxp 5026 . 2 class (R × {0R})
61, 5wceq 1474 1 wff ℝ = (R × {0R})
Colors of variables: wff setvar class
This definition is referenced by:  opelreal  9808  elreal  9809  elreal2  9810  axresscn  9826  ax1rid  9839  avril1  26505
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