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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 7129 | . . . 4 ⊢ ((𝐴 ∈ N ∧ 𝐷 ∈ N) → (𝐴 ·N 𝐷) ∈ N) | |
2 | mulclpi 7129 | . . . 4 ⊢ ((𝐵 ∈ N ∧ 𝐶 ∈ N) → (𝐵 ·N 𝐶) ∈ N) | |
3 | pinn 7110 | . . . . 5 ⊢ ((𝐴 ·N 𝐷) ∈ N → (𝐴 ·N 𝐷) ∈ ω) | |
4 | pinn 7110 | . . . . 5 ⊢ ((𝐵 ·N 𝐶) ∈ N → (𝐵 ·N 𝐶) ∈ ω) | |
5 | nndceq 6388 | . . . . 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 7157 | . . 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 3525 class class class wbr 3924 ωcom 4499 (class class class)co 5767 Ncnpi 7073 ·N cmi 7075 ~Q ceq 7080 |
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 2119 ax-coll 4038 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-iinf 4497 |
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 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-ral 2419 df-rex 2420 df-reu 2421 df-rab 2423 df-v 2683 df-sbc 2905 df-csb 2999 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-iun 3810 df-br 3925 df-opab 3985 df-mpt 3986 df-tr 4022 df-id 4210 df-iord 4283 df-on 4285 df-suc 4288 df-iom 4500 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-ima 4547 df-iota 5083 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 df-fv 5126 df-ov 5770 df-oprab 5771 df-mpo 5772 df-1st 6031 df-2nd 6032 df-recs 6195 df-irdg 6260 df-oadd 6310 df-omul 6311 df-ni 7105 df-mi 7107 df-enq 7148 |
This theorem is referenced by: enqdc1 7163 |
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