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Mirrors > Home > ILE Home > Th. List > enqdc | GIF version |
Description: The equivalence relation for positive fractions is decidable. (Contributed by Jim Kingdon, 7-Sep-2019.) |
Ref | Expression |
---|---|
enqdc | ⊢ (((𝐴 ∈ N ∧ 𝐵 ∈ N) ∧ (𝐶 ∈ N ∧ 𝐷 ∈ N)) → DECID 〈𝐴, 𝐵〉 ~Q 〈𝐶, 𝐷〉) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mulclpi 7136 | . . . 4 ⊢ ((𝐴 ∈ N ∧ 𝐷 ∈ N) → (𝐴 ·N 𝐷) ∈ N) | |
2 | mulclpi 7136 | . . . 4 ⊢ ((𝐵 ∈ N ∧ 𝐶 ∈ N) → (𝐵 ·N 𝐶) ∈ N) | |
3 | pinn 7117 | . . . . 5 ⊢ ((𝐴 ·N 𝐷) ∈ N → (𝐴 ·N 𝐷) ∈ ω) | |
4 | pinn 7117 | . . . . 5 ⊢ ((𝐵 ·N 𝐶) ∈ N → (𝐵 ·N 𝐶) ∈ ω) | |
5 | nndceq 6395 | . . . . 5 ⊢ (((𝐴 ·N 𝐷) ∈ ω ∧ (𝐵 ·N 𝐶) ∈ ω) → DECID (𝐴 ·N 𝐷) = (𝐵 ·N 𝐶)) | |
6 | 3, 4, 5 | syl2an 287 | . . . 4 ⊢ (((𝐴 ·N 𝐷) ∈ N ∧ (𝐵 ·N 𝐶) ∈ N) → DECID (𝐴 ·N 𝐷) = (𝐵 ·N 𝐶)) |
7 | 1, 2, 6 | syl2an 287 | . . 3 ⊢ (((𝐴 ∈ N ∧ 𝐷 ∈ N) ∧ (𝐵 ∈ N ∧ 𝐶 ∈ N)) → DECID (𝐴 ·N 𝐷) = (𝐵 ·N 𝐶)) |
8 | 7 | an42s 578 | . 2 ⊢ (((𝐴 ∈ N ∧ 𝐵 ∈ N) ∧ (𝐶 ∈ N ∧ 𝐷 ∈ N)) → DECID (𝐴 ·N 𝐷) = (𝐵 ·N 𝐶)) |
9 | enqbreq 7164 | . . 3 ⊢ (((𝐴 ∈ N ∧ 𝐵 ∈ N) ∧ (𝐶 ∈ N ∧ 𝐷 ∈ N)) → (〈𝐴, 𝐵〉 ~Q 〈𝐶, 𝐷〉 ↔ (𝐴 ·N 𝐷) = (𝐵 ·N 𝐶))) | |
10 | 9 | dcbid 823 | . 2 ⊢ (((𝐴 ∈ N ∧ 𝐵 ∈ N) ∧ (𝐶 ∈ N ∧ 𝐷 ∈ N)) → (DECID 〈𝐴, 𝐵〉 ~Q 〈𝐶, 𝐷〉 ↔ DECID (𝐴 ·N 𝐷) = (𝐵 ·N 𝐶))) |
11 | 8, 10 | mpbird 166 | 1 ⊢ (((𝐴 ∈ N ∧ 𝐵 ∈ N) ∧ (𝐶 ∈ N ∧ 𝐷 ∈ N)) → DECID 〈𝐴, 𝐵〉 ~Q 〈𝐶, 𝐷〉) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 DECID wdc 819 = wceq 1331 ∈ wcel 1480 〈cop 3530 class class class wbr 3929 ωcom 4504 (class class class)co 5774 Ncnpi 7080 ·N cmi 7082 ~Q ceq 7087 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-coll 4043 ax-sep 4046 ax-nul 4054 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 ax-iinf 4502 |
This theorem depends on definitions: df-bi 116 df-dc 820 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-ral 2421 df-rex 2422 df-reu 2423 df-rab 2425 df-v 2688 df-sbc 2910 df-csb 3004 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-int 3772 df-iun 3815 df-br 3930 df-opab 3990 df-mpt 3991 df-tr 4027 df-id 4215 df-iord 4288 df-on 4290 df-suc 4293 df-iom 4505 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 df-fv 5131 df-ov 5777 df-oprab 5778 df-mpo 5779 df-1st 6038 df-2nd 6039 df-recs 6202 df-irdg 6267 df-oadd 6317 df-omul 6318 df-ni 7112 df-mi 7114 df-enq 7155 |
This theorem is referenced by: enqdc1 7170 |
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