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Mirrors > Home > MPE Home > Th. List > dvdsflip | Structured version Visualization version GIF version |
Description: An involution of the divisors of a number. (Contributed by Stefan O'Rear, 12-Sep-2015.) (Proof shortened by Mario Carneiro, 13-May-2016.) |
Ref | Expression |
---|---|
dvdsflip.a | ⊢ 𝐴 = {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} |
dvdsflip.f | ⊢ 𝐹 = (𝑦 ∈ 𝐴 ↦ (𝑁 / 𝑦)) |
Ref | Expression |
---|---|
dvdsflip | ⊢ (𝑁 ∈ ℕ → 𝐹:𝐴–1-1-onto→𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dvdsflip.f | . 2 ⊢ 𝐹 = (𝑦 ∈ 𝐴 ↦ (𝑁 / 𝑦)) | |
2 | dvdsflip.a | . . . . 5 ⊢ 𝐴 = {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} | |
3 | 2 | eleq2i 2693 | . . . 4 ⊢ (𝑦 ∈ 𝐴 ↔ 𝑦 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) |
4 | dvdsdivcl 15038 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝑦 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑦) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) | |
5 | 3, 4 | sylan2b 492 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 𝑦 ∈ 𝐴) → (𝑁 / 𝑦) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) |
6 | 5, 2 | syl6eleqr 2712 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ 𝑦 ∈ 𝐴) → (𝑁 / 𝑦) ∈ 𝐴) |
7 | 2 | eleq2i 2693 | . . . 4 ⊢ (𝑧 ∈ 𝐴 ↔ 𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) |
8 | dvdsdivcl 15038 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝑧 ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) → (𝑁 / 𝑧) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) | |
9 | 7, 8 | sylan2b 492 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 𝑧 ∈ 𝐴) → (𝑁 / 𝑧) ∈ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁}) |
10 | 9, 2 | syl6eleqr 2712 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ 𝑧 ∈ 𝐴) → (𝑁 / 𝑧) ∈ 𝐴) |
11 | ssrab2 3687 | . . . . . . 7 ⊢ {𝑥 ∈ ℕ ∣ 𝑥 ∥ 𝑁} ⊆ ℕ | |
12 | 2, 11 | eqsstri 3635 | . . . . . 6 ⊢ 𝐴 ⊆ ℕ |
13 | 12 | sseli 3599 | . . . . 5 ⊢ (𝑦 ∈ 𝐴 → 𝑦 ∈ ℕ) |
14 | 12 | sseli 3599 | . . . . 5 ⊢ (𝑧 ∈ 𝐴 → 𝑧 ∈ ℕ) |
15 | 13, 14 | anim12i 590 | . . . 4 ⊢ ((𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴) → (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) |
16 | nncn 11028 | . . . . . . 7 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℂ) | |
17 | 16 | adantr 481 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → 𝑁 ∈ ℂ) |
18 | nncn 11028 | . . . . . . 7 ⊢ (𝑦 ∈ ℕ → 𝑦 ∈ ℂ) | |
19 | 18 | ad2antrl 764 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → 𝑦 ∈ ℂ) |
20 | nncn 11028 | . . . . . . 7 ⊢ (𝑧 ∈ ℕ → 𝑧 ∈ ℂ) | |
21 | 20 | ad2antll 765 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → 𝑧 ∈ ℂ) |
22 | nnne0 11053 | . . . . . . 7 ⊢ (𝑧 ∈ ℕ → 𝑧 ≠ 0) | |
23 | 22 | ad2antll 765 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → 𝑧 ≠ 0) |
24 | 17, 19, 21, 23 | divmul3d 10835 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → ((𝑁 / 𝑧) = 𝑦 ↔ 𝑁 = (𝑦 · 𝑧))) |
25 | nnne0 11053 | . . . . . . 7 ⊢ (𝑦 ∈ ℕ → 𝑦 ≠ 0) | |
26 | 25 | ad2antrl 764 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → 𝑦 ≠ 0) |
27 | 17, 21, 19, 26 | divmul2d 10834 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → ((𝑁 / 𝑦) = 𝑧 ↔ 𝑁 = (𝑦 · 𝑧))) |
28 | 24, 27 | bitr4d 271 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ ℕ ∧ 𝑧 ∈ ℕ)) → ((𝑁 / 𝑧) = 𝑦 ↔ (𝑁 / 𝑦) = 𝑧)) |
29 | 15, 28 | sylan2 491 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → ((𝑁 / 𝑧) = 𝑦 ↔ (𝑁 / 𝑦) = 𝑧)) |
30 | eqcom 2629 | . . 3 ⊢ (𝑦 = (𝑁 / 𝑧) ↔ (𝑁 / 𝑧) = 𝑦) | |
31 | eqcom 2629 | . . 3 ⊢ (𝑧 = (𝑁 / 𝑦) ↔ (𝑁 / 𝑦) = 𝑧) | |
32 | 29, 30, 31 | 3bitr4g 303 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ (𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴)) → (𝑦 = (𝑁 / 𝑧) ↔ 𝑧 = (𝑁 / 𝑦))) |
33 | 1, 6, 10, 32 | f1o2d 6887 | 1 ⊢ (𝑁 ∈ ℕ → 𝐹:𝐴–1-1-onto→𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 = wceq 1483 ∈ wcel 1990 ≠ wne 2794 {crab 2916 class class class wbr 4653 ↦ cmpt 4729 –1-1-onto→wf1o 5887 (class class class)co 6650 ℂcc 9934 0cc0 9936 · cmul 9941 / cdiv 10684 ℕcn 11020 ∥ cdvds 14983 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-z 11378 df-dvds 14984 |
This theorem is referenced by: phisum 15495 fsumdvdscom 24911 |
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