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Theorem enqeceq 3841
Description: Equivalence class equality of positive fractions in terms of positive integers.
Assertion
Ref Expression
enqeceq (((ANBN) ∧ (CNDN)) → ([⟨A, B⟩] ~Q = [⟨C, D⟩] ~Q ↔ (A ·N D) = (B ·N C)))

Proof of Theorem enqeceq
StepHypRef Expression
1 pm3.26 256 . . 3 (((ANBN) ∧ (CNDN)) → (ANBN))
2 opelxpi 2455 . . . 4 ((ANBN) → ⟨A, B⟩ ∈ (N × N))
3 dmenq 3839 . . . . 5 dom ~Q = (N × N)
43eleq2i 1153 . . . 4 (⟨A, B⟩ ∈ dom ~Q ↔ ⟨A, B⟩ ∈ (N × N))
52, 4sylibr 175 . . 3 ((ANBN) → ⟨A, B⟩ ∈ dom ~Q )
6 opex 1893 . . . 4 C, D⟩ ∈ V
7 enqer 3840 . . . 4 Er ~Q
86, 7erthdm 3220 . . 3 (⟨A, B⟩ ∈ dom ~Q → ([⟨A, B⟩] ~Q = [⟨C, D⟩] ~Q ↔ ⟨A, B⟩ ~QC, D⟩))
91, 5, 83syl 21 . 2 (((ANBN) ∧ (CNDN)) → ([⟨A, B⟩] ~Q = [⟨C, D⟩] ~Q ↔ ⟨A, B⟩ ~QC, D⟩))
10 enqbreq 3838 . 2 (((ANBN) ∧ (CNDN)) → (⟨A, B⟩ ~QC, D⟩ ↔ (A ·N D) = (B ·N C)))
119, 10bitrd 406 1 (((ANBN) ∧ (CNDN)) → ([⟨A, B⟩] ~Q = [⟨C, D⟩] ~Q ↔ (A ·N D) = (B ·N C)))
Colors of variables: wff set class
Syntax hints:   → wi 2   ↔ wb 127   ∧ wa 196   = wceq 1091   ∈ wcel 1092  ⟨cop 1810   class class class wbr 2054   × cxp 2408  dom cdm 2410  (class class class)co 3001  [cec 3198  Ncnpi 3766   ·N cmi 3768 &nbSp; ~Q ceq 3772
This theorem is referenced by:  ordpipq 3850  ltsopq 3869  prlem934b 3932
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-un 1076  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3or 582  df-3an 583  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-rex 1206  df-reu 1207  df-rab 1208  df-v 1349  df-sbc 1441  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-if 1777  df-pw 1799  df-sn 1811  df-pr 1812  df-tp 1814  df-op 1815  df-uni 1920  df-int 1966  df-iun 1996  df-tr 2042  df-br 2063  df-opab 2098  df-eprel 2122  df-id 2125  df-po 2128  df-so 2138  df-fr 2169  df-we 2186  df-ord 2202  df-on 2203  df-lim 2204  df-suc 2205  df-om 2373  df-xp 2424  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fn 2433  df-fv 2438  df-rdg 2970  df-opr 3003  df-oprab 3004  df-oadd 3106  df-omul 3107  df-er 3200  df-ec 3202  df-ni 3794  df-mi 3796  df-enq 3831
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