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Theorem ltrnq 10003
Description: Ordering property of reciprocal for positive fractions. Proposition 9-2.6(iv) of [Gleason] p. 120. (Contributed by NM, 9-Mar-1996.) (Revised by Mario Carneiro, 10-May-2013.) (New usage is discouraged.)
Assertion
Ref Expression
ltrnq (𝐴 <Q 𝐵 ↔ (*Q𝐵) <Q (*Q𝐴))

Proof of Theorem ltrnq
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ltrelnq 9950 . . 3 <Q ⊆ (Q × Q)
21brel 5308 . 2 (𝐴 <Q 𝐵 → (𝐴Q𝐵Q))
31brel 5308 . . 3 ((*Q𝐵) <Q (*Q𝐴) → ((*Q𝐵) ∈ Q ∧ (*Q𝐴) ∈ Q))
4 dmrecnq 9992 . . . . 5 dom *Q = Q
5 0nnq 9948 . . . . 5 ¬ ∅ ∈ Q
64, 5ndmfvrcl 6360 . . . 4 ((*Q𝐵) ∈ Q𝐵Q)
74, 5ndmfvrcl 6360 . . . 4 ((*Q𝐴) ∈ Q𝐴Q)
86, 7anim12ci 601 . . 3 (((*Q𝐵) ∈ Q ∧ (*Q𝐴) ∈ Q) → (𝐴Q𝐵Q))
93, 8syl 17 . 2 ((*Q𝐵) <Q (*Q𝐴) → (𝐴Q𝐵Q))
10 breq1 4789 . . . 4 (𝑥 = 𝐴 → (𝑥 <Q 𝑦𝐴 <Q 𝑦))
11 fveq2 6332 . . . . 5 (𝑥 = 𝐴 → (*Q𝑥) = (*Q𝐴))
1211breq2d 4798 . . . 4 (𝑥 = 𝐴 → ((*Q𝑦) <Q (*Q𝑥) ↔ (*Q𝑦) <Q (*Q𝐴)))
1310, 12bibi12d 334 . . 3 (𝑥 = 𝐴 → ((𝑥 <Q 𝑦 ↔ (*Q𝑦) <Q (*Q𝑥)) ↔ (𝐴 <Q 𝑦 ↔ (*Q𝑦) <Q (*Q𝐴))))
14 breq2 4790 . . . 4 (𝑦 = 𝐵 → (𝐴 <Q 𝑦𝐴 <Q 𝐵))
15 fveq2 6332 . . . . 5 (𝑦 = 𝐵 → (*Q𝑦) = (*Q𝐵))
1615breq1d 4796 . . . 4 (𝑦 = 𝐵 → ((*Q𝑦) <Q (*Q𝐴) ↔ (*Q𝐵) <Q (*Q𝐴)))
1714, 16bibi12d 334 . . 3 (𝑦 = 𝐵 → ((𝐴 <Q 𝑦 ↔ (*Q𝑦) <Q (*Q𝐴)) ↔ (𝐴 <Q 𝐵 ↔ (*Q𝐵) <Q (*Q𝐴))))
18 recclnq 9990 . . . . . 6 (𝑥Q → (*Q𝑥) ∈ Q)
19 recclnq 9990 . . . . . 6 (𝑦Q → (*Q𝑦) ∈ Q)
20 mulclnq 9971 . . . . . 6 (((*Q𝑥) ∈ Q ∧ (*Q𝑦) ∈ Q) → ((*Q𝑥) ·Q (*Q𝑦)) ∈ Q)
2118, 19, 20syl2an 583 . . . . 5 ((𝑥Q𝑦Q) → ((*Q𝑥) ·Q (*Q𝑦)) ∈ Q)
22 ltmnq 9996 . . . . 5 (((*Q𝑥) ·Q (*Q𝑦)) ∈ Q → (𝑥 <Q 𝑦 ↔ (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑥) <Q (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑦)))
2321, 22syl 17 . . . 4 ((𝑥Q𝑦Q) → (𝑥 <Q 𝑦 ↔ (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑥) <Q (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑦)))
24 mulcomnq 9977 . . . . . . 7 (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑥) = (𝑥 ·Q ((*Q𝑥) ·Q (*Q𝑦)))
25 mulassnq 9983 . . . . . . 7 ((𝑥 ·Q (*Q𝑥)) ·Q (*Q𝑦)) = (𝑥 ·Q ((*Q𝑥) ·Q (*Q𝑦)))
26 mulcomnq 9977 . . . . . . 7 ((𝑥 ·Q (*Q𝑥)) ·Q (*Q𝑦)) = ((*Q𝑦) ·Q (𝑥 ·Q (*Q𝑥)))
2724, 25, 263eqtr2i 2799 . . . . . 6 (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑥) = ((*Q𝑦) ·Q (𝑥 ·Q (*Q𝑥)))
28 recidnq 9989 . . . . . . . 8 (𝑥Q → (𝑥 ·Q (*Q𝑥)) = 1Q)
2928oveq2d 6809 . . . . . . 7 (𝑥Q → ((*Q𝑦) ·Q (𝑥 ·Q (*Q𝑥))) = ((*Q𝑦) ·Q 1Q))
30 mulidnq 9987 . . . . . . . 8 ((*Q𝑦) ∈ Q → ((*Q𝑦) ·Q 1Q) = (*Q𝑦))
3119, 30syl 17 . . . . . . 7 (𝑦Q → ((*Q𝑦) ·Q 1Q) = (*Q𝑦))
3229, 31sylan9eq 2825 . . . . . 6 ((𝑥Q𝑦Q) → ((*Q𝑦) ·Q (𝑥 ·Q (*Q𝑥))) = (*Q𝑦))
3327, 32syl5eq 2817 . . . . 5 ((𝑥Q𝑦Q) → (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑥) = (*Q𝑦))
34 mulassnq 9983 . . . . . . 7 (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑦) = ((*Q𝑥) ·Q ((*Q𝑦) ·Q 𝑦))
35 mulcomnq 9977 . . . . . . . 8 ((*Q𝑦) ·Q 𝑦) = (𝑦 ·Q (*Q𝑦))
3635oveq2i 6804 . . . . . . 7 ((*Q𝑥) ·Q ((*Q𝑦) ·Q 𝑦)) = ((*Q𝑥) ·Q (𝑦 ·Q (*Q𝑦)))
3734, 36eqtri 2793 . . . . . 6 (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑦) = ((*Q𝑥) ·Q (𝑦 ·Q (*Q𝑦)))
38 recidnq 9989 . . . . . . . 8 (𝑦Q → (𝑦 ·Q (*Q𝑦)) = 1Q)
3938oveq2d 6809 . . . . . . 7 (𝑦Q → ((*Q𝑥) ·Q (𝑦 ·Q (*Q𝑦))) = ((*Q𝑥) ·Q 1Q))
40 mulidnq 9987 . . . . . . . 8 ((*Q𝑥) ∈ Q → ((*Q𝑥) ·Q 1Q) = (*Q𝑥))
4118, 40syl 17 . . . . . . 7 (𝑥Q → ((*Q𝑥) ·Q 1Q) = (*Q𝑥))
4239, 41sylan9eqr 2827 . . . . . 6 ((𝑥Q𝑦Q) → ((*Q𝑥) ·Q (𝑦 ·Q (*Q𝑦))) = (*Q𝑥))
4337, 42syl5eq 2817 . . . . 5 ((𝑥Q𝑦Q) → (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑦) = (*Q𝑥))
4433, 43breq12d 4799 . . . 4 ((𝑥Q𝑦Q) → ((((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑥) <Q (((*Q𝑥) ·Q (*Q𝑦)) ·Q 𝑦) ↔ (*Q𝑦) <Q (*Q𝑥)))
4523, 44bitrd 268 . . 3 ((𝑥Q𝑦Q) → (𝑥 <Q 𝑦 ↔ (*Q𝑦) <Q (*Q𝑥)))
4613, 17, 45vtocl2ga 3425 . 2 ((𝐴Q𝐵Q) → (𝐴 <Q 𝐵 ↔ (*Q𝐵) <Q (*Q𝐴)))
472, 9, 46pm5.21nii 367 1 (𝐴 <Q 𝐵 ↔ (*Q𝐵) <Q (*Q𝐴))
Colors of variables: wff setvar class
Syntax hints:  wb 196  wa 382   = wceq 1631  wcel 2145   class class class wbr 4786  cfv 6031  (class class class)co 6793  Qcnq 9876  1Qc1q 9877   ·Q cmq 9880  *Qcrq 9881   <Q cltq 9882
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-8 2147  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751  ax-sep 4915  ax-nul 4923  ax-pow 4974  ax-pr 5034  ax-un 7096
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 837  df-3or 1072  df-3an 1073  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-eu 2622  df-mo 2623  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ne 2944  df-ral 3066  df-rex 3067  df-reu 3068  df-rmo 3069  df-rab 3070  df-v 3353  df-sbc 3588  df-csb 3683  df-dif 3726  df-un 3728  df-in 3730  df-ss 3737  df-pss 3739  df-nul 4064  df-if 4226  df-pw 4299  df-sn 4317  df-pr 4319  df-tp 4321  df-op 4323  df-uni 4575  df-iun 4656  df-br 4787  df-opab 4847  df-mpt 4864  df-tr 4887  df-id 5157  df-eprel 5162  df-po 5170  df-so 5171  df-fr 5208  df-we 5210  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-pred 5823  df-ord 5869  df-on 5870  df-lim 5871  df-suc 5872  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-fv 6039  df-ov 6796  df-oprab 6797  df-mpt2 6798  df-om 7213  df-1st 7315  df-2nd 7316  df-wrecs 7559  df-recs 7621  df-rdg 7659  df-1o 7713  df-oadd 7717  df-omul 7718  df-er 7896  df-ni 9896  df-mi 9898  df-lti 9899  df-mpq 9933  df-ltpq 9934  df-enq 9935  df-nq 9936  df-erq 9937  df-mq 9939  df-1nq 9940  df-rq 9941  df-ltnq 9942
This theorem is referenced by:  addclprlem1  10040  reclem2pr  10072  reclem3pr  10073
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