MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  dmrecnq Structured version   Visualization version   GIF version

Theorem dmrecnq 9478
Description: Domain of reciprocal on positive fractions. (Contributed by NM, 6-Mar-1996.) (Revised by Mario Carneiro, 10-Jul-2014.) (New usage is discouraged.)
Assertion
Ref Expression
dmrecnq dom *Q = Q

Proof of Theorem dmrecnq
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 df-rq 9427 . . . . . 6 *Q = ( ·Q “ {1Q})
2 cnvimass 5238 . . . . . 6 ( ·Q “ {1Q}) ⊆ dom ·Q
31, 2eqsstri 3484 . . . . 5 *Q ⊆ dom ·Q
4 mulnqf 9459 . . . . . 6 ·Q :(Q × Q)⟶Q
54fdmi 5791 . . . . 5 dom ·Q = (Q × Q)
63, 5sseqtri 3486 . . . 4 *Q ⊆ (Q × Q)
7 dmss 5082 . . . 4 (*Q ⊆ (Q × Q) → dom *Q ⊆ dom (Q × Q))
86, 7ax-mp 5 . . 3 dom *Q ⊆ dom (Q × Q)
9 dmxpid 5103 . . 3 dom (Q × Q) = Q
108, 9sseqtri 3486 . 2 dom *QQ
11 recclnq 9476 . . . . . . . 8 (𝑥Q → (*Q𝑥) ∈ Q)
12 opelxpi 4912 . . . . . . . 8 ((𝑥Q ∧ (*Q𝑥) ∈ Q) → ⟨𝑥, (*Q𝑥)⟩ ∈ (Q × Q))
1311, 12mpdan 690 . . . . . . 7 (𝑥Q → ⟨𝑥, (*Q𝑥)⟩ ∈ (Q × Q))
14 df-ov 6366 . . . . . . . 8 (𝑥 ·Q (*Q𝑥)) = ( ·Q ‘⟨𝑥, (*Q𝑥)⟩)
15 recidnq 9475 . . . . . . . 8 (𝑥Q → (𝑥 ·Q (*Q𝑥)) = 1Q)
1614, 15syl5eqr 2553 . . . . . . 7 (𝑥Q → ( ·Q ‘⟨𝑥, (*Q𝑥)⟩) = 1Q)
17 ffn 5784 . . . . . . . 8 ( ·Q :(Q × Q)⟶Q → ·Q Fn (Q × Q))
18 fniniseg 6070 . . . . . . . 8 ( ·Q Fn (Q × Q) → (⟨𝑥, (*Q𝑥)⟩ ∈ ( ·Q “ {1Q}) ↔ (⟨𝑥, (*Q𝑥)⟩ ∈ (Q × Q) ∧ ( ·Q ‘⟨𝑥, (*Q𝑥)⟩) = 1Q)))
194, 17, 18mp2b 10 . . . . . . 7 (⟨𝑥, (*Q𝑥)⟩ ∈ ( ·Q “ {1Q}) ↔ (⟨𝑥, (*Q𝑥)⟩ ∈ (Q × Q) ∧ ( ·Q ‘⟨𝑥, (*Q𝑥)⟩) = 1Q))
2013, 16, 19sylanbrc 686 . . . . . 6 (𝑥Q → ⟨𝑥, (*Q𝑥)⟩ ∈ ( ·Q “ {1Q}))
2120, 1syl6eleqr 2594 . . . . 5 (𝑥Q → ⟨𝑥, (*Q𝑥)⟩ ∈ *Q)
22 df-br 4435 . . . . 5 (𝑥*Q(*Q𝑥) ↔ ⟨𝑥, (*Q𝑥)⟩ ∈ *Q)
2321, 22sylibr 219 . . . 4 (𝑥Q𝑥*Q(*Q𝑥))
24 vex 3069 . . . . 5 𝑥 ∈ V
25 fvex 5937 . . . . 5 (*Q𝑥) ∈ V
2624, 25breldm 5088 . . . 4 (𝑥*Q(*Q𝑥) → 𝑥 ∈ dom *Q)
2723, 26syl 17 . . 3 (𝑥Q𝑥 ∈ dom *Q)
2827ssriv 3458 . 2 Q ⊆ dom *Q
2910, 28eqssi 3470 1 dom *Q = Q
Colors of variables: wff setvar class
Syntax hints:  wb 191  wa 378   = wceq 1468  wcel 1937  wss 3426  {csn 3995  cop 4001   class class class wbr 4434   × cxp 4878  ccnv 4879  dom cdm 4880  cima 4883   Fn wfn 5628  wf 5629  cfv 5633  (class class class)co 6363  Qcnq 9362  1Qc1q 9363   ·Q cmq 9366  *Qcrq 9367
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1698  ax-4 1711  ax-5 1789  ax-6 1836  ax-7 1883  ax-8 1939  ax-9 1946  ax-10 1965  ax-11 1970  ax-12 1983  ax-13 2137  ax-ext 2485  ax-sep 4558  ax-nul 4567  ax-pow 4619  ax-pr 4680  ax-un 6659
This theorem depends on definitions:  df-bi 192  df-or 379  df-an 380  df-3or 1022  df-3an 1023  df-tru 1471  df-ex 1693  df-nf 1697  df-sb 1829  df-eu 2357  df-mo 2358  df-clab 2492  df-cleq 2498  df-clel 2501  df-nfc 2635  df-ne 2677  df-ral 2796  df-rex 2797  df-reu 2798  df-rmo 2799  df-rab 2800  df-v 3068  df-sbc 3292  df-csb 3386  df-dif 3429  df-un 3431  df-in 3433  df-ss 3440  df-pss 3442  df-nul 3758  df-if 3909  df-pw 3980  df-sn 3996  df-pr 3998  df-tp 4000  df-op 4002  df-uni 4229  df-iun 4309  df-br 4435  df-opab 4494  df-mpt 4495  df-tr 4531  df-eprel 4791  df-id 4795  df-po 4801  df-so 4802  df-fr 4839  df-we 4841  df-xp 4886  df-rel 4887  df-cnv 4888  df-co 4889  df-dm 4890  df-rn 4891  df-res 4892  df-ima 4893  df-pred 5431  df-ord 5477  df-on 5478  df-lim 5479  df-suc 5480  df-iota 5597  df-fun 5635  df-fn 5636  df-f 5637  df-f1 5638  df-fo 5639  df-f1o 5640  df-fv 5641  df-ov 6366  df-oprab 6367  df-mpt2 6368  df-om 6770  df-1st 6870  df-2nd 6871  df-wrecs 7105  df-recs 7167  df-rdg 7205  df-1o 7259  df-oadd 7263  df-omul 7264  df-er 7440  df-ni 9382  df-mi 9384  df-lti 9385  df-mpq 9419  df-enq 9421  df-nq 9422  df-erq 9423  df-mq 9425  df-1nq 9426  df-rq 9427
This theorem is referenced by:  ltrnq  9489  reclem2pr  9558
  Copyright terms: Public domain W3C validator