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Mirrors > Home > MPE Home > Th. List > df-r | Structured version Visualization version GIF version |
Description: Define the set of real numbers. (Contributed by NM, 22-Feb-1996.) (New usage is discouraged.) |
Ref | Expression |
---|---|
df-r | ⊢ ℝ = (R × {0R}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cr 9814 | . 2 class ℝ | |
2 | cnr 9566 | . . 3 class R | |
3 | c0r 9567 | . . . 4 class 0R | |
4 | 3 | csn 4125 | . . 3 class {0R} |
5 | 2, 4 | cxp 5036 | . 2 class (R × {0R}) |
6 | 1, 5 | wceq 1475 | 1 wff ℝ = (R × {0R}) |
Colors of variables: wff setvar class |
This definition is referenced by: opelreal 9830 elreal 9831 elreal2 9832 axresscn 9848 ax1rid 9861 avril1 26711 |
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