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Theorem dfrp2 10522
Description: Alternate definition of the positive real numbers. (Contributed by Thierry Arnoux, 4-May-2020.)
Assertion
Ref Expression
dfrp2  |-  RR+  =  ( 0 (,) +oo )

Proof of Theorem dfrp2
StepHypRef Expression
1 ltpnf 10014 . . . . . 6  |-  ( x  e.  RR  ->  x  < +oo )
21adantr 276 . . . . 5  |-  ( ( x  e.  RR  /\  0  <  x )  ->  x  < +oo )
32pm4.71i 391 . . . 4  |-  ( ( x  e.  RR  /\  0  <  x )  <->  ( (
x  e.  RR  /\  0  <  x )  /\  x  < +oo ) )
4 df-3an 1006 . . . 4  |-  ( ( x  e.  RR  /\  0  <  x  /\  x  < +oo )  <->  ( (
x  e.  RR  /\  0  <  x )  /\  x  < +oo ) )
53, 4bitr4i 187 . . 3  |-  ( ( x  e.  RR  /\  0  <  x )  <->  ( x  e.  RR  /\  0  < 
x  /\  x  < +oo ) )
6 elrp 9889 . . 3  |-  ( x  e.  RR+  <->  ( x  e.  RR  /\  0  < 
x ) )
7 0xr 8225 . . . 4  |-  0  e.  RR*
8 pnfxr 8231 . . . 4  |- +oo  e.  RR*
9 elioo2 10155 . . . 4  |-  ( ( 0  e.  RR*  /\ +oo  e.  RR* )  ->  (
x  e.  ( 0 (,) +oo )  <->  ( x  e.  RR  /\  0  < 
x  /\  x  < +oo ) ) )
107, 8, 9mp2an 426 . . 3  |-  ( x  e.  ( 0 (,) +oo )  <->  ( x  e.  RR  /\  0  < 
x  /\  x  < +oo ) )
115, 6, 103bitr4i 212 . 2  |-  ( x  e.  RR+  <->  x  e.  (
0 (,) +oo )
)
1211eqriv 2228 1  |-  RR+  =  ( 0 (,) +oo )
Colors of variables: wff set class
Syntax hints:    /\ wa 104    <-> wb 105    /\ w3a 1004    = wceq 1397    e. wcel 2202   class class class wbr 4088  (class class class)co 6017   RRcr 8030   0cc0 8031   +oocpnf 8210   RR*cxr 8212    < clt 8213   RR+crp 9887   (,)cioo 10122
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1re 8125  ax-addrcl 8128  ax-rnegex 8140  ax-pre-ltirr 8143  ax-pre-ltwlin 8144  ax-pre-lttrn 8145
This theorem depends on definitions:  df-bi 117  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-po 4393  df-iso 4394  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-iota 5286  df-fun 5328  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-le 8219  df-rp 9888  df-ioo 10126
This theorem is referenced by: (None)
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